JP4692000B2 - Travel time calculation system and travel time calculation method - Google Patents

Description

The present invention relates to a travel time calculation system for calculating an average travel time of a vehicle between two points on a road network, and in particular, a system for detecting a vehicle to which a smart plate (electronic license plate) is attached, an existing AVI system, Is a travel time calculation system and a travel time calculation method .

  Conventionally, as an average travel time calculation system for calculating an average travel time of a vehicle between two points on a road network, there are AVI systems described in Patent Documents 1 and 2 and the like. The AVI system collects information on a plurality of vehicle detection devices installed at a plurality of points in the road network and passing vehicles detected by each vehicle detection device, and the vehicle between two points on the road network is collected using the collected information. A host device (hereinafter referred to as an AVI server) for calculating the average travel time. The vehicle detection device captures a license plate of a passing vehicle with a camera, processes the captured image, and obtains a license plate number of the passing vehicle. The vehicle detection device transmits the acquired license plate number of the passing vehicle, the time when the license plate of the passing vehicle is imaged by the camera, and the identification code for identifying the device itself to the AVI server as information relating to the passing vehicle. In the AVI server, the license plate number is used as information for identifying the passing vehicle, the time when the license plate of the passing vehicle is imaged by the camera is used as the passing time of the passing vehicle, and the identification code of the vehicle detection device is used to identify the passing vehicle. Used as information to identify the detected point. The AVI server collects and stores information on passing vehicles transmitted from each vehicle detection device. The AVI server stores an installation point (camera imaging area) in the road network for each vehicle detection device. Specifically, an identification code and an installation point (for example, a place name, latitude and longitude) are stored in association with each vehicle detection device. The AVI server can obtain the license plate number of the passing vehicle and the passing time for each installation point of the vehicle detection device from the stored information on the passing vehicle transmitted from each vehicle detection device.

  The AVI server calculates the average travel time of the vehicle between two points on the road network using the stored information on the passing vehicle transmitted from each vehicle detection device. Between the two points of the road network where the average travel time can be calculated is between the installation points of the vehicle detection device. The AVI server determines the downstream point between the two points for calculating the average travel time and the passing number of the same license plate number detected at both the upstream point, that is, both the upstream and downstream points. For each vehicle that has passed, the difference between the passage time at the downstream point and the passage time at the upstream point is calculated as the travel time between the two points. Then, the average travel time between the two points calculated for each passing vehicle is calculated, and this is used as the average travel time of the vehicle between the two points.

  In the calculation of average travel time, the AVI server targets passing vehicles whose license plate number is acquired at a downstream point within a certain time (for example, within the last 30 minutes or within the last hour). Passing vehicles for which the license plate number was previously obtained are excluded. Thereby, the average travel time of the vehicle between the two points of the road network is made to correspond to the change of the traffic situation in the road network. It has also been proposed that for travel vehicles whose calculated travel time is significantly different from the travel times of other passing vehicles, the travel time is not used for calculating the average travel time. If the calculated travel time is significantly different from the travel time of other passing vehicles, the travel mode between the two points for calculating the average travel time of the passing vehicle is different from that of a general vehicle, or the upstream side It is considered that the vehicle detected at 1 and the vehicle detected at the downstream point were different. Therefore, for a passing vehicle whose calculated travel time is significantly different from that of other passing vehicles, the average travel time between two points on the road network is not used for calculating the average travel time. The calculation accuracy can be improved.

  The average travel time is used to calculate the predicted travel time to the downstream side based on the upstream departure time, and to provide the predicted travel time information to the driver of the vehicle heading downstream. Yes.

  On the other hand, smart plates (electronic license plates) are being put into practical use. Recently, various systems using smart plates have been tested in various places. Here, the smart plate will be briefly described. The smart plate includes a storage unit (IC chip) for storing vehicle specification information such as a license plate number of the vehicle and vehicle specification information described in the automobile inspection certificate, and a wireless communication unit for performing wireless communication. . It is currently under consideration to install this smart plate on the vehicle. The smart plate performs transmission of vehicle information stored in the storage unit and reception of information stored in the storage unit by the wireless communication unit.

In addition, as a system using a smart plate, a system that calculates the average travel time of a vehicle between two points on the road network (hereinafter referred to as an SP system), a vehicle management system in a parking lot, and a specific area. Systems for limiting vehicles have been proposed. For example, in the SP system, wireless communication terminal devices that acquire vehicle information stored in the smart plate by wireless communication with the smart plate are installed at a plurality of points on the road network. Each wireless communication terminal device collects vehicle information acquired by wireless communication with a smart plate attached to a passing vehicle by a host device (hereinafter referred to as an SP server). Then, the SP server uses the collected vehicle information to calculate the average travel time of the vehicle between two points on the road network in the same manner as the AVI server of the AVI system described above. In the parking lot management system, wireless communication terminal devices are installed at the entrances and exits of the parking lot. Each wireless communication type terminal device collects vehicle information acquired by wireless communication with a smart plate attached to a vehicle entering or leaving a parking lot by a host device. The host device uses the collected information to manage the vehicles parked in the parking lot and to settle the parking fee based on the parking time for the vehicles entering the parking lot.
Japanese Patent Publication No. 5-86600 Japanese Patent Application Laid-Open No. 64-42771

  However, considering the SP system that uses the smart plate to calculate the average travel time of the vehicle between two points on the road network, as described above, at present, the smart plate is being verified. Therefore, it seems that it takes a period of several years to several tens of years before the wireless communication terminal device that performs wireless communication with the smart plate is finely installed on the road network. In other words, a situation in which the wireless communication type terminal device is not finely installed in the road network exists for a period of several to ten years.

  The smart plate is quickly attached to each vehicle due to the legislation.

  In the SP system, the average travel time is calculated between the two points where the wireless communication terminal device is installed. Therefore, the average travel time until the wireless communication terminal device is finely installed on the road network. The distance between two points where time can be calculated is limited. Therefore, it takes a period of several to ten and several years before a practical SP system can be constructed. During this period, a smart plate attached to a vehicle or a wireless communication terminal device installed on a road network is used. There is a problem that it cannot be used effectively and is wasted.

The object of the present invention is to acquire vehicle information by wireless communication with a smart plate or a smart plate attached to the vehicle even when a device for acquiring vehicle information by wireless communication with the smart plate is not finely installed on the road network. A travel time calculation system and a travel time calculation method that improve the average travel time calculation accuracy by effectively using the devices installed on the road network to calculate the average travel time between two points on the road network There is to do.

  Another object of the present invention is to provide a travel time calculation system that detects a vehicle in which at least one of a smart plate and a license plate has been tampered with.

  The travel time calculation system of the present invention has the following configuration in order to solve the above problems and achieve the object.

(1) An imaging unit that is installed at a plurality of points on the road network and captures a license plate of a passing vehicle in an imaging area; and an image that acquires a license plate number of a passing vehicle by processing a captured image captured by the imaging unit A plurality of first plates having processing means and license plate number output means for outputting the license plate number of the passing vehicle acquired by the image processing means together with acquisition related information including acquisition time and acquisition point of the license plate number. A vehicle detection device of
Wireless communication means installed at a plurality of points on the road network and acquiring vehicle information including a type of a passing vehicle and a license plate number in a wireless communication area by wireless communication with a smart plate attached to the passing vehicle; A plurality of second vehicle detection devices having vehicle information output means for outputting the vehicle information of the passing vehicle acquired by the communication means together with acquisition related information including an acquisition time and an acquisition point of the vehicle information;
A plurality of the first vehicle detection devices collect and store the license plate number of the passing vehicle output by the license plate number output means and the acquisition related information relating to the acquisition time and acquisition point of the license plate number. Acquisition related information including first passing vehicle information storage means, vehicle information of passing vehicles output by the plurality of second vehicle detection devices by the vehicle information output means, and acquisition times and acquisition points of the vehicle information Based on the storage contents of the second passing vehicle information storage means, the first passing vehicle information storage means, and the second passing vehicle information storage means between the two points of the road network. Average travel time calculating means for calculating the average travel time of the vehicle,
The average travel time calculation means uses information on emergency vehicles and route buses that are predetermined vehicle types stored in the first passing vehicle information storage means and the second passing vehicle information storage means. And a host device for calculating the average travel time of the vehicle between two points on the road network .

  In this configuration, the first vehicle detection device is installed at a plurality of points on the road network. In the first vehicle detection device, a picked-up image of a license plate of a passing vehicle imaged by the imaging means is processed by an image processing means, and a license plate number of the passing vehicle is acquired. Further, the license plate number output means outputs the number plate number of the passing vehicle acquired by the image processing means to the host device together with the acquisition related information including the acquisition time and the acquisition point at which the license plate number was acquired. An existing AVI system vehicle detection device can be used as the first vehicle detection device.

In addition, second vehicle detection devices are installed at a plurality of points on the road network. In this second vehicle detection device, the wireless communication means performs wireless communication with a smart plate (electronic license plate) attached to the passing vehicle, and acquires vehicle information including the type and license plate number of the vehicle. The types of vehicles referred to here are general vehicles, trucks, route buses, fire engines, ambulances, police cars (hereinafter, fire engines, ambulances, and police cars are collectively referred to as emergency vehicles). The smart plate stores vehicle information including a vehicle type and a license plate number in a storage unit, and is attached to the vehicle. Further, the vehicle information output means outputs the vehicle information of the passing vehicle acquired by the wireless communication means to the host device together with acquisition related information including the acquisition time and the acquisition point at which the vehicle information is acquired.

  The host device collects the acquisition related information including the license plate number output by each first vehicle detection device, the acquisition time and the acquisition point of the license plate number, and stores them in the first passing vehicle information storage means. Vehicle information including the license plate number output by each second vehicle detection device, acquisition related information including the acquisition time and acquisition point of the vehicle information are collected and stored in the second passing vehicle information storage means. The host device calculates the average travel time between two points on the road network based on the stored contents of the first passing vehicle information storage means and the second passing vehicle storage means in the average travel time calculation means. In the first vehicle detection device and the second vehicle detection device, the license plate number of the passing vehicle detected together is acquired. Therefore, the average travel time of the vehicle between two points where at least one of the first vehicle detection device or the second vehicle detection device is installed can be calculated by using the license plate number. In addition, by using an existing AVI system terminal device as the first vehicle detection device, the second vehicle detection device that acquires vehicle information through wireless communication with a smart plate attached to the vehicle is a road network. The smart plate and the second vehicle detection device can be effectively used for calculating the average travel time between two points in the road network even during a period when they are not finely installed. Further, the integration with the AVI system increases the distance between two points where the average travel time can be calculated, and the average travel time can be calculated more finely.

Furthermore, the host device calculates the average travel time of the vehicle between two points on the road network without using information on emergency vehicles and route buses that are different from ordinary vehicles in the road network. Therefore, the calculation accuracy of the average travel time of the vehicle between two points on the road network can be further improved.
When the host device calculates the average travel time of the vehicle between the two points where the first vehicle detection device is installed, the second vehicle is installed at a point located between the two points. What is necessary is just to recognize the kind of vehicle using the vehicle information of the passing vehicle which the detection apparatus acquired.

( 2 ) The route bus which is a predetermined vehicle type stored in the first passing vehicle information storage means and the second passing vehicle information storage means, in the average travel time calculation means of the host device. It also has a route bus travel time calculation function for calculating the average travel time of a route bus between two points on the road network using only this information .

In this configuration, the route bus average travel time between two points on the road network can be calculated by the route bus travel time calculation function .

( 3 ) The host device is a first vehicle in which an imaging area of a license plate of a passing vehicle in the imaging means overlaps with a wireless communication area of a smart plate attached to the passing vehicle in the wireless communication means. A determination means for determining whether the license plate numbers acquired from the same passing vehicle by the detection device and the second vehicle detection device match;
Output means for outputting a message to the effect that the determination means determines that they do not match.

  In this configuration, for a passing vehicle having the same determination means, the number plate number of the passing vehicle acquired by the first vehicle detection device and the vehicle information of the passing vehicle acquired by the second vehicle detection device are included. It is determined whether or not the license plate number that is present matches. There is a high possibility that at least one of the license plate or the smart plate is falsified in the passing vehicle that is determined not to match by the determination means. When it is determined that the determination means do not match, the output means outputs that effect. At this time, the output means outputs the license plate number of the passing vehicle and the vehicle information, so that it is possible to promptly check the vehicle and the like. Therefore, a vehicle in which at least one of the license plate or the smart plate has been tampered with can be quickly cleared. In particular, a vehicle in which a license plate or a smart plate is tampered with is often used for crimes, and thus has an effect of preventing crimes.

  According to this invention, by integrating with the existing AVI system, the period when the second vehicle detection device for acquiring vehicle information by wireless communication with the smart plate attached to the vehicle is not finely installed on the road network, The smart plate and the second vehicle detection device can be effectively used for calculating the average travel time between two points on the road network. Further, the integration with the AVI system increases the distance between two points where the average travel time can be calculated, and the average travel time can be calculated more finely.

  Hereinafter, a travel time calculation system according to an embodiment of the present invention will be described.

  The travel time calculation system of this embodiment includes an existing AVI system and a system (hereinafter referred to as an SP system) that calculates an average travel time of a vehicle between two points on the road network using a smart plate. It is an integrated system. FIG. 1 is a diagram showing a configuration of a travel time calculation system according to an embodiment of the present invention. The travel time calculation system of this embodiment is installed at a plurality of points on the road network, images a license plate of a passing vehicle, and processes the captured image to obtain a license plate number of the passing vehicle. Number plate of this passing vehicle from device 1 (corresponding to the first vehicle detection device referred to in the present invention) and smart plates (electronic number plates) installed at a plurality of points on the road network and attached to the passing vehicle A plurality of wireless communication type terminal devices 2 (corresponding to the second vehicle detection device referred to in the present invention) that acquire vehicle information including numbers, and license plate numbers of passing vehicles acquired by each image type terminal device 1 AVI server 3 to collect, and smart plate server 4 (hereinafter referred to as SP server 4) that collects vehicle information of passing vehicles that each wireless communication type terminal device 2 has earned. And the license plate number of the passing vehicle acquired by each image type terminal device 1 is collected from the AVI server 3, and the vehicle information of the passing vehicle acquired by each wireless communication type terminal device 2 is collected from the SP server 4. And an integrated server 5 (corresponding to a host device in the present invention) that stores and calculates the average travel time of the vehicle between two points on the road network. The plurality of image-type terminal devices 1 and the AVI server 3 have a configuration of an existing AVI system. The plurality of wireless communication terminal devices 2 and the SP server 4 have the SP system configuration referred to here. The integration server 5 is a configuration for integrating the AVI system and the SP system.

  FIG. 2 is a diagram illustrating installation points of the image type terminal device and the wireless communication type terminal device in the road network. In FIG. 2, the image type terminal device 1 is indicated by Δ and the wireless communication type terminal device 2 is indicated by ○. As described above, the image-type terminal device 1 has the configuration of the existing AVI system, and has already been finely installed on the road network. On the other hand, the wireless communication type terminal device 2 is a terminal device that performs wireless communication with a smart plate that is currently being considered for practical use, and is hardly installed in the road network at present. It seems that it takes a certain period of time, that is, several years to several tens of years, until the wireless communication type terminal device 2 is finely installed on the road network. FIG. 2 shows a state when the wireless communication terminal device 2 is not finely installed on the road network. The wireless communication type terminal device 2 may be installed near the already installed image type terminal device 1 or may be installed at a point where the image type terminal device 1 is not installed.

  At present, attaching a smart plate to a vehicle is in the direction of legislation, and the attachment of the smart plate to the vehicle is performed quickly, and in a few years after the legislation, there are no vehicles with no smart plate attached. I think that the. Details of the smart plate will be described later.

  FIG. 3 is a block diagram showing a configuration of the image type terminal device. The image type terminal device 1 processes a picked-up image of a control plate 10 that controls the operation of the main body, a camera 11 that picks up a license plate of a passing vehicle, and a license plate of a passing vehicle picked up by the camera 11 to obtain a license plate number. The image processing unit 12 that acquires the current time, the clock unit 13 that measures the current time, and the communication unit 14 that transmits the number plate number of the passing vehicle acquired by the image processing unit 12 to the AVI server 3. As shown in FIG. 4, the camera 11 is installed above the road (lane) and tilted toward the road surface so as to capture the passing vehicle from substantially the front. The camera 11 images a license plate attached in front of a passing vehicle. The imaging area of the camera 11 becomes an acquisition point where the license plate number of the passing vehicle is acquired, and this acquisition point becomes the installation position of the image type terminal device 1. FIG. 4 shows an example in which a camera 11 that captures a license plate of a passing vehicle is attached to each lane on a four-lane road (two lanes on one side). At this point, four image type terminal devices 1 are installed.

  The image type terminal device 1 may include four cameras 11 and the image processing unit 12 may process a captured image of a license plate of a passing vehicle captured by each camera 11. In this case, the number of the image type terminal devices 1 installed at this point can be reduced to one.

  The image processing unit 3 performs image processing on the captured image captured by the camera 11 and acquires the license plate number of the passing vehicle. As shown in FIG. 5, the license plate has a region display, a classification number, a usage display, and a series designation number. The area display is a character, such as Naniwa, Yokohama, or Shinagawa, that displays the transportation branch office that registered the vehicle. The classification number is a two-digit or three-digit number indicating the type and use of the vehicle, and indicates an ordinary cargo vehicle, an ordinary passenger vehicle, an ordinary passenger vehicle, or the like. The usage display is a single hiragana character that indicates business use, private use, rental car, or the like. The series designation number is a four-digit number. The image processing unit 12 acquires at least a series designation number as a license plate number. The image processing unit 12 may be configured to acquire one or more of area display, classification number, and application display as a license plate number in addition to the series designation number. Since the classification number and application display are smaller in character than the series designation number, it is necessary to use a high-definition camera 11 having a relatively large number of pixels in order to ensure the recognition accuracy of the character by image processing. The communication unit 14 transmits to the AVI server 3 the acquisition related information including the license plate number acquired by the image processing unit 12 and the acquisition time and acquisition point of the license plate number. The image-type terminal device 1 uses the time counted by the clock unit 13 when the camera 11 captures the license plate of the passing vehicle as the license plate number acquisition time. Further, the image type terminal device 1 uses an identification code for identifying its own device as information indicating an acquisition point.

  FIG. 6 is a block diagram showing the configuration of the AVI server. The AVI server 3 includes a control unit 30 that controls the operation of the main body, a first communication unit 31 that communicates with the image type terminal device 1, a license plate number transmitted from each image type terminal device 1, and this license plate. A storage unit 32 that collects and stores acquisition-related information including number acquisition time and acquisition position, and a second communication unit 33 that communicates with the integrated server 5 are provided. As shown in FIG. 6, the storage unit 32 is provided with a storage area for each image type terminal device 1 for storing the number plate number of the passing vehicle and the acquisition time in association with each other. When the AVI server 3 receives the license plate number of the passing vehicle transmitted from the image type terminal device 1 by the first communication unit 31, the image included in the acquisition related information transmitted together with the license plate number. An identification code of the mobile terminal device 1 is obtained. And the storage area of the memory | storage part 32 allocated to the image type terminal device 1 which transmitted the license plate number of this passing vehicle this time is judged, and the license plate number and acquisition time which were transmitted this time to this storage area are shown. Store it in association. Therefore, in the storage unit 32 of the AVI server 3, the license plate number of the passing vehicle acquired by each image type terminal device 1 is stored separately for each acquisition point. When the second communication unit 33 receives the license plate number of the passing vehicle transmitted from the image type terminal device 1 by the first communication unit 31, the second communication unit 33 transfers the license plate number to the integrated server 5. At this time, the acquisition related information transmitted together with the license plate number is also transferred to the integrated server 5. Further, the AVI server 3 stores the acquisition point of the license plate number of the passing vehicle for each image type terminal device 1. An installation point of the image type terminal device 1 (strictly speaking, an imaging area of the camera 11) is stored as a license plate number acquisition point in the image type terminal device 1.

  Here, when the AVI server 3 receives the number plate number of the passing vehicle transmitted from the image type terminal device 1 by the first communication unit 31, it immediately transfers this number plate number to the integrated server 5. Although it is configured, the storage content of the storage unit 32 may be transmitted from the second communication unit 33 to the integrated server 5 in response to a request from the integrated server 5, or the storage unit at a predetermined timing It is good also as a structure which transmits the memory content of 32 to the integrated server 5 from the 2nd communication part 33. FIG.

Next, the smart plate attached to the vehicle will be described. FIG. 7 is a block diagram showing the configuration of the smart plate. The smart plate 6 includes a control unit 60 that controls the operation of the main body, a storage unit 61 that stores vehicle information including a license plate number, a wireless communication unit 62 that performs wireless communication with the wireless communication terminal device 2, and It has. The storage unit 61 is configured by a nonvolatile memory. The storage unit 61 includes vehicle license plate numbers (regional display, classification number, usage display, serial designation number), and vehicle specification information (vehicle weight, vehicle height, vehicle width, vehicle Etc.), the type of vehicle (route bus, ambulance, fire truck, police car, private car, etc.), etc. are stored. The smart plate 6 is provided with a battery (not shown) that supplies operating power. Smart plate 6, normal, but by operating the wireless communication unit 62 to be able to receive polling from the wireless communications type terminal device 2, and stops the power supply to the storage unit 61. When the wireless communication unit 62 receives polling from the wireless communication type terminal device 2, the smart plate 6 starts supplying power to the storage unit 61 and ends wireless communication with the wireless communication type terminal device 2. The power supply to 61 is stopped. Wireless communication in the wireless communication unit 62 is performed by ASK modulation, and has a frequency of 5.8 GHz band and a communication speed of 1 Mbps.

  In addition, the smart plate 6 is in a direction to be legally attached to the vehicle. When the legislation is established, it is considered that the smart plate 6 is attached to the vehicle at the time of vehicle inspection or when a new vehicle is purchased. Therefore, the vehicle to which the smart plate is attached spreads quickly.

  FIG. 8 is a block diagram illustrating a configuration of a wireless communication terminal device. The wireless communication terminal device 2 communicates with the control unit 20 that controls the operation of the main body, the wireless communication unit 21 that performs wireless communication with the smart plate 6, the clock unit 22 that measures the current time, and the SP server 4. And a communication unit 23. The wireless communication type terminal device 2 may be installed so that the smart plate attached to the passing vehicle passes through the communication area of the wireless communication unit 21, may be erected on the roadside, or above the lane. It may be attached. The wireless communication unit 21 repeatedly performs polling for requesting a response to the smart plate located in the wireless communication area at a constant time interval, for example, every few seconds (1-2 seconds). When the wireless communication terminal device 2 receives a response from the smart plate 6 in the wireless communication unit 21, the wireless communication terminal device 2 determines that there is a passing vehicle with the smart plate 6 attached in the wireless communication area of the wireless communication unit 21. Wireless communication with the plate 6 is executed. The wireless communication type terminal device 2 acquires the vehicle information stored in the storage unit 61 by the smart plate 6 through this wireless communication. The communication unit 23 transmits to the SP server 4 the acquisition related information including the acquisition time and the acquisition point of the vehicle information together with the vehicle information acquired by the wireless communication with the smart plate 6 in the wireless communication unit 21. When the wireless communication terminal device 2 performs wireless communication with the smart plate 6 by the wireless communication unit 21, the time measured by the clock unit 22 is set as the vehicle information acquisition time. Further, the wireless communication type terminal device 2 uses an identification code for identifying the own device as information indicating an acquisition point.

  FIG. 9 is a block diagram showing the configuration of the SP server. The SP server 4 is transmitted from the control unit 40 that controls the operation of the main body, the first communication unit 41 that communicates with the wireless communication terminal device 2 installed in the road network, and the wireless communication terminal devices 41. The vehicle information storage part 42 which collects and memorize | stores the vehicle information which came, and the 2nd communication part 43 which communicates with the integrated server 5 are provided. As shown in FIG. 9, the vehicle information storage unit 42 is provided with a storage area for storing the vehicle information of the passing vehicle and the acquisition time in association with each wireless communication terminal device 2. When the SP server 4 receives the vehicle information of the passing vehicle transmitted from the wireless communication terminal device 2 by the first communication unit 41, the wireless communication included in the acquisition related information transmitted together with the vehicle information. An identification code of the type terminal device 2 is obtained. Then, the storage area of the vehicle information storage unit 42 assigned to the wireless communication type terminal device 2 that has transmitted the vehicle information of the passing vehicle this time is determined, and the vehicle information and the acquisition time that have been transmitted this time to this storage area, Are stored in association with each other. Therefore, in the vehicle information storage unit 42 of the SP server 4, the vehicle information of the passing vehicle acquired by the wireless communication type terminal device 2 is stored separately for each acquisition point. In addition, when the second communication unit 43 receives the vehicle information of the passing vehicle transmitted from the wireless communication type terminal device 2 by the first communication unit 41, the second communication unit 43 transfers the vehicle information to the integrated server 5. At this time, the acquisition related information transmitted together with the vehicle information is also transferred to the integrated server 5. The SP server 4 stores a vehicle information acquisition point of a passing vehicle for each wireless communication terminal device 2. An installation point of the wireless communication terminal device 2 (strictly speaking, a wireless communication area of the wireless communication unit 21) is stored as a vehicle information acquisition point in the wireless communication terminal device 2.

  Here, when the SP server 4 receives the vehicle information of the passing vehicle transmitted from the wireless communication terminal device 2 by the first communication unit 41, the SP server 4 immediately transfers the vehicle information to the integrated server 5. However, it is good also as a structure which transmits the memory | storage content of the vehicle information storage part 42 to the integrated server 5 from the 2nd communication part 43 according to the request | requirement from the integrated server 5, and when it becomes a predetermined timing, it is vehicle The storage content of the information storage unit 42 may be transmitted from the second communication unit 43 to the integrated server 5.

  FIG. 10 is a block diagram illustrating a configuration of the integrated server. The integrated server 5 includes a control unit 50 that controls the operation of the main body, a communication unit 51 that communicates with the AVI server 3 and the SP server 4, and a storage unit 52 that stores information transmitted from the AVI server 3 and the SP server 4. A display unit 53 that displays the average travel time between two points on the calculated road network, and an operation unit 54 that performs an input operation on the main body. The integrated server 5 is obtained by the license plate number of the passing vehicle acquired by the image type terminal device 1 installed at a plurality of points on the road network and the wireless communication type terminal device 2 installed at a plurality of points of the road network. Using the vehicle information, the average travel time of the vehicle between two points on the road network is calculated. The communication unit 51 is provided with an AVI communication unit that performs communication with the AVI server 3 and an SP communication unit that performs communication with the SP server 4. The storage unit 52 stores an AVI storage unit 52A that stores a license plate number of a passing vehicle transferred from the AVI server 3, and an SP storage unit that stores vehicle information of a passing vehicle transferred from the SP server 4. 52B. The AVI storage unit 52A corresponds to the first passing vehicle information storage unit referred to in the present invention, and the SP storage unit 52B corresponds to the second passing vehicle information storage unit referred to in the present invention. Similarly to the storage unit 32 of the AVI server 3, the AVI storage unit 52 </ b> A is provided with a storage area for each image-type terminal device 1 that stores the number plate number of the passing vehicle and the acquisition time in association with each other. When the integrated server 5 receives the number plate number of the passing vehicle acquired by the image type terminal device 1 transmitted from the AVI server 3 by the communication unit 51, the integrated server 5 is included in the acquisition related information transmitted together with the number plate number. The identification code of the image-type terminal device 1 is obtained. Then, the storage area of the storage unit 52A for AVI assigned to the image type terminal device 1 that acquired the license plate number of the passing vehicle received this time is determined, and the license plate number transmitted this time to this storage area and the acquisition The time is associated and stored. Therefore, in the AVI storage unit 52A, the license plate number of the passing vehicle acquired by the image type terminal device 1 is stored separately for each acquisition point. Similarly to the vehicle information storage unit 42 of the SP server 4, the SP storage unit 52 </ b> B is provided with a storage area for storing the vehicle information of the passing vehicle and the acquisition time in association with each wireless communication terminal device 2. ing. When the integrated server 5 receives the vehicle information of the passing vehicle acquired by the wireless communication terminal device 2 transmitted from the SP server 4 by the communication unit 51, the integrated server 5 is included in the acquisition related information transmitted together with the vehicle information. An identification code of the wireless communication terminal device 2 is obtained. Then, the storage area of the SP storage unit 52B assigned to the wireless communication type terminal device 2 that acquired the vehicle information of the passing vehicle received this time is determined, and the license plate number transmitted this time and the acquisition are acquired in this storage area The time is associated and stored. Therefore, in the SP storage unit 52B, the vehicle information of the passing vehicle acquired by the wireless communication terminal device 2 is stored separately for each acquisition point. The integrated server 5 calculates the average travel time of the vehicle between the two points where the image type terminal device 1 or the wireless communication type terminal device 2 is installed, based on the storage contents of the AVI storage unit 52A and the SP storage unit 52B. calculate.

  Further, the integrated server 5 stores a license plate number acquisition point for each image type terminal device 1 and stores a vehicle information acquisition point for each wireless communication type terminal device 2. Furthermore, the integrated server 5 stores the image type terminal device 1 and the radio communication type terminal device 2 in which the imaging area of the camera 11 and the radio communication area of the radio communication unit 21 overlap with each other. The image-type terminal device 1 and the wireless communication-type terminal device 2 in which the imaging area of the camera 11 and the wireless communication area of the wireless communication unit 21 overlap each other acquire license plates and vehicle information from the same vehicle at approximately the same time. To do.

  Further, the integrated server 5 instructs the AVI server 3 to set the time of the clock unit 13 of each image type terminal device 1. Further, the SP server 4 is instructed to set the time of the clock unit 22 of each wireless communication terminal device 2. The time adjustment instruction to the AVI server 3 and the SP server 4 may be performed at the same timing or at different timings. For example, it may be configured to instruct the AVI server 3 and the SP server 4 to set the time when a predetermined input operation is performed on the operation unit 54, or a predetermined time, for example, 0:00 am, Then, it may be configured to instruct the AVI server 3 and the SP server 4 to set the time. When the AVI server 3 is instructed by the integrated server 5 to set the time of the clock unit 13 of each image type terminal device 1, the AVI server 3 executes processing related to the time setting of the clock unit 13 for each image type terminal device 1. In addition, when the SP server 4 is instructed by the integrated server 5 to set the time of the clock unit 22 of each wireless communication terminal device 2, the SP server 4 performs processing related to the time setting of the clock unit 22 to each wireless communication terminal device 2. Execute.

  Next, the operation of the travel time calculation system according to the embodiment of the present invention will be described. The travel time calculation system of this embodiment is a system that integrates the existing AVI system and the SP system as described above, and calculates the average travel time of the vehicle between two points on the road network. First, the operation of the image type terminal device 1 installed in the road network will be described. FIG. 11 is a flowchart showing the operation of the image type terminal device. Each image-type terminal device 1 installed in the road network detects a passing vehicle located in the imaging area of the camera 11 (s1), or is instructed by the AVI server 3 to set the time of the clock unit 13. (S2). The image type terminal device 1 is provided with a configuration for detecting a passing vehicle located in the imaging area of the camera 11. For example, infrared light is irradiated toward the imaging area (road surface), and reflected light from the road surface or the vehicle is received. And the structure which determines whether it is the reflected light from a road surface or the reflected light from a vehicle by the time after irradiating infrared light until it receives the reflected light is provided.

  When the image-type terminal device 1 detects a passing vehicle located in the imaging area in s1, the camera 11 images the license plate of the passing vehicle (s3). At this time, the time measured by the time measuring unit 13 is determined as the acquisition time of the license plate number of the current passing vehicle (s4). The image type terminal device 1 processes the picked-up image of the passing plate of the passing vehicle taken by the camera 11 by the image processing unit 12, and acquires the number plate number of the passing vehicle (s5). The license plate number acquired in s5 is a series designation number written on the license plate. In addition to the series designation number, any one or more of the area display, the classification number, and the usage display may be acquired as the license plate number. The image type terminal device 1 transmits the acquisition related information including the acquisition time determined in s4 and the identification code of the own device together with the license plate number of the passing vehicle acquired in s5 from the communication unit 14 to the AVI server 3 (s6). ), Return to s1.

  Thus, every time the image type terminal device 1 acquires the license plate number of the passing vehicle, the image type terminal device 1 transmits the acquisition related information to the AVI server 3 together with the acquired license plate number of the passing vehicle.

  Further, when the AVI server 3 gives an instruction to set the time of the clock unit 13 in s2, the image type terminal device 1 performs processing related to the time setting of the clock unit 13 (s7), and returns to s1. Details of the time adjustment processing for s7 will be described later.

  Next, the operation of the AVI server 3 will be described. FIG. 12 is a flowchart showing the operation of the AVI server. The AVI server 3 receives the license plate number of the passing vehicle transmitted from any of the image type terminal devices 1 installed in the road network by the first communication unit 31 (s11), or from the integrated server 5 Waiting for an instruction to set the time to the clock unit 13 of each image type terminal device 1 (s12). When the AVI server 3 receives the license plate number of the passing vehicle transmitted from any of the image type terminal devices 1 installed in the road network by the first communication unit 31, the AVI server 3 transmits the license plate number together with the license plate number. The identification code of the image type terminal device 1 that has transmitted the license plate number this time is read from the acquired related information (s13). The AVI server 3 determines the storage area of the storage unit 32 assigned to the image type terminal device 1 of the identification code read out in s13, and is included in the license plate number received this time and the acquisition related information in that storage area. Are stored in association with each other (s14). Further, the AVI server 3 executes a process of transferring the license plate number and the acquisition related information received by the second communication unit 33 by the first communication unit 31 to the integrated server 5 (s15), and returns to s11.

  As described above, when the AVI server 3 receives the license plate number of the passing vehicle transmitted from any of the image type terminal devices 1 installed in the road network, the AVI server 3 stores the received license plate number in the storage unit 32 and receives it. The license plate number and the acquisition related information are transferred to the integrated server 5. Moreover, since the AVI server 3 collects the license plate number of the passing vehicle acquired by each image type terminal device 1 installed in the road network and stores it in the storage unit 32, the image type terminal device 1 is installed. The average travel time of the vehicle can be calculated between the two points.

  Here, when the AVI server 3 receives the number plate number of the passing vehicle transmitted from the image type terminal device 1 by the first communication unit 31, it immediately transfers this number plate number to the integrated server 5. Although it is configured, the storage content of the storage unit 32 may be transmitted from the second communication unit 33 to the integrated server 5 in response to a request from the integrated server 5, or the storage unit at a predetermined timing It is good also as a structure which transmits the memory content of 32 to the integrated server 5 from the 2nd communication part 33. FIG.

  In addition, when there is an instruction for time adjustment from the integrated server 5 to the clock unit 13 of each image type terminal device 1, the AVI server 3 executes processing related to time adjustment of the clock unit 13 to each image type terminal device 1. Then (s16), the process returns to s11. Details of the time adjustment processing according to s16 will be described later.

  Next, the operation of the wireless communication terminal device 2 will be described. FIG. 13 is a flowchart showing the operation of the wireless communication terminal device. The wireless communication type terminal device 2 waits for the time to poll the smart plate 6 (s21) or the SP server 4 is instructed to set the time of the clock unit 22 (s22). The wireless communication terminal device 2 is set to perform polling for the smart plate 6 at regular intervals, for example, every 1 to 2 seconds. If the wireless communication type terminal device 2 determines that it is time to perform polling in s21, it performs polling for requesting a response to the smart plate 6 located in the wireless communication area (s23). When the smart plate 6 attached to the passing vehicle is located within the wireless communication area of the wireless communication unit 23, the smart plate 6 receives polling performed by the wireless communication type terminal device 2, and receives from the wireless communication unit 62. Send a response to polling. Therefore, if the smart plate 6 attached to the vehicle is located in the wireless communication area of the wireless communication unit 21, the wireless communication terminal device 2 receives the response to the polling performed in s23, and conversely performs wireless communication. If the smart plate 6 attached to the vehicle is not located in the wireless communication area of the unit 21, the response to the polling performed in s23 is not received. In other words, if a passing vehicle is located in the wireless communication area of the wireless communication unit 21, a response to the polling performed in s23 is received, and conversely, the passing vehicle is located in the wireless communication area of the wireless communication unit 21. If not, a response to the polling performed in s23 is not received.

  In addition, the smart plate 6 that has received the polling from the wireless communication terminal device 2 starts to supply power to the storage unit 61 and the like. The smart plate 6 supplies power to the wireless communication unit 62 even when polling from the wireless communication terminal device 2 is not received, and the wireless communication unit 62 receives power from the wireless communication terminal device 2. It is kept ready to receive polls.

  The wireless communication type terminal device 2 determines whether or not there is a response from the smart plate 6 to the polling performed in s23 (s24), and returns to s21 if there is no response. On the contrary, if there is a response, wireless communication with the smart plate 6 that has responded this time is executed, and the vehicle information stored in the storage unit 61 by this smart plate is acquired (s25). Wireless communication with the smart plate 6 is a process of requesting transmission of stored vehicle information and receiving vehicle information transmitted from the smart plate 6 in response to this request.

  Further, when the smart plate 6 transmits the vehicle information to the wireless communication terminal device 2, the smart plate 6 stops the power supply to the storage unit 61. However, power supply to the wireless communication unit 62 is not stopped.

  When the wireless communication terminal device 2 receives the vehicle information in s25, the time measured by the time measuring unit 22 at this time is determined as the acquisition time of the vehicle information of the current passing vehicle (s26). The wireless communication type terminal device 2 transmits the acquisition time information determined in s26 together with the vehicle information received in s25 and the acquisition related information including the identification code of the own device from the communication unit 23 to the SP server 4 (s27), and s21 Return to.

  As described above, the wireless communication type terminal device 2 transmits the acquisition related information to the SP server 4 together with the acquired vehicle information of the passing vehicle every time the vehicle information of the passing vehicle is received through the wireless communication with the smart plate 6. .

  Further, when the SP server 4 is instructed to set the time of the clock unit 22 in s22, the wireless communication type terminal device 2 performs processing related to the time setting of the clock unit 22 (s28), and returns to s21. Details of the time adjustment processing according to s28 will be described later.

  Next, the operation of the SP server 4 will be described. FIG. 14 is a flowchart showing the operation of the SP server. The SP server 4 receives the vehicle information of the passing vehicle transmitted from any one of the wireless communication terminal devices 2 installed in the road network by the first communication unit 41 (s31), or from the integrated server 5 It waits for a time adjustment instruction to the clock unit 22 of each wireless communication terminal device 2 (s32). When the first communication unit 41 receives the vehicle information of the passing vehicle transmitted from any of the wireless communication terminal devices 2 installed in the road network, the SP server 3 is transmitted together with the vehicle information. The identification code of the wireless communication type terminal device 2 that has transmitted the vehicle information this time is read from the acquisition related information (s33). The SP server 4 determines the storage area of the vehicle information storage unit 42 assigned to the wireless communication type terminal device 2 of the identification code read in s33, and stores the vehicle information received this time in the storage area and the acquisition related information. The acquired acquisition time is stored in association with each other (s34). Further, the SP server 4 executes a process of transferring the vehicle information and the acquisition related information received by the second communication unit 43 at the first communication unit 41 to the integrated server 5 (s35), and returns to s31.

  As described above, when the SP server 4 receives the vehicle information of the passing vehicle from any of the wireless communication terminal devices 2 installed in the road network, the SP server 4 stores the vehicle information in the vehicle information storage unit 42 and integrates the received vehicle information. Transfer to server 5. Moreover, since the SP server 4 collects the vehicle information of the passing vehicle acquired by each wireless communication terminal device 2 installed in the road network and stores it in the vehicle information storage unit 32, the wireless communication terminal device 2 The average travel time of the vehicle can be calculated between two installed locations.

  Here, when the SP server 4 receives the vehicle information of the passing vehicle transmitted from the wireless communication terminal device 2 by the first communication unit 41, the SP server 4 immediately transfers the vehicle information to the integrated server 5. However, it is good also as a structure which transmits the memory | storage content of the vehicle information storage part 42 to the integrated server 5 from the 2nd communication part 43 according to the request | requirement from the integrated server 5, and when it becomes a predetermined timing, it is vehicle The storage content of the information storage unit 42 may be transmitted from the second communication unit 43 to the integrated server 5.

  Further, when there is an instruction for time adjustment from the integrated server 5 to the clock unit 22 of each wireless communication terminal device 2, the SP server 4 performs processing related to time adjustment of the clock unit 22 to each wireless communication terminal device 2. Is executed (s36), and the process returns to s31. Details of the time adjustment processing according to s36 will be described later.

Next, the operation of the integrated server 5 will be described. The integrated server 5
(1) The license plate number transmitted from the AVI server 3 and the acquisition related information relating to the license plate number are stored in the AVI storage unit 52A, and the vehicle information and the vehicle information transmitted from the SP server 4 are applied. Passing vehicle information collection processing for storing acquisition related information in the SP storage unit 52B,
(2) Average travel time calculation processing for calculating the average travel time of the vehicle between two points on the road network where the image type terminal device 1 or the wireless communication type terminal device 2 is installed,
(3) The AVI server 3 is instructed to set the time of the clock unit 13 of each image type terminal device 1, and the SP server 4 is instructed to set the time of the clock unit 22 of each wireless communication type terminal device 2. Time adjustment processing,
(4) A falsified vehicle detection process for detecting a vehicle with a high possibility that the license plate or the smart plate 6 has been falsified,
Execute.

  First, passing vehicle information collection processing will be described. FIG. 15 is a flowchart showing passing vehicle information collection processing in the integrated server. The integrated server 5 receives the license plate number transmitted from the AVI server 3 in the communication unit 51, the acquisition related information relating to the license plate number, or the vehicle information transmitted from the SP server 4 and the vehicle information. When the acquisition related information relating to is received, this passing vehicle information collection processing is executed. The integrated server 5 determines whether the information regarding the passing vehicle received by the communication unit 51 is transmitted from the AVI server 3 or transmitted from the SP server 4 (s41). If the integrated server 5 determines that it has been transmitted from the AVI server 3 in s41, it identifies the image type terminal device 1 that has detected the passing vehicle to which the current license plate number has been transmitted (s42). The integrated server 5 identifies the image type terminal device 1 from the identification code of the image type terminal device 1 included in the acquisition related information transmitted together with the license plate number. The integrated server 5 determines the storage area of the AVI storage unit 52A assigned to the image type terminal device 1 specified in s42, and obtains the license plate number transmitted from the AVI server 3 this time to the storage area and the acquisition. The acquisition time included in the related information is stored in association with each other (s43), and the process returns to s41.

  Moreover, if the integrated server 5 determines with the thing transmitted from SP server 4 by s41, it will specify the radio | wireless communication type terminal device 2 which detected the passing vehicle to which vehicle information was transmitted this time (s44). The integrated server 5 identifies the wireless communication terminal device 2 from the identification code of the wireless communication terminal device 2 included in the acquisition related information transmitted together with the vehicle information. The integrated server 5 determines the storage area of the SP storage unit 52B assigned to the wireless communication type terminal device 2 specified in s44, and acquires the vehicle information transmitted from the SP server 4 this time to the storage area and the acquisition. The acquisition time included in the related information is stored in association with each other (s45), and the process returns to s41.

  As described above, when the license plate number of the passing vehicle is transmitted from any of the image type terminal devices 1 installed in the road network, the AVI server 3 transfers the license plate number to the integrated server 5. ing. The integrated server 5 collects the number plate numbers of passing vehicles detected by each image type terminal device 1 installed in the road network, and divides the image plate number for each image type terminal device 1 to detect the number plate number of the passing vehicle detected. And the acquisition time are associated with each other and stored in the AVI storage unit 52A. The integrated server 5 stores an installation point for each image type terminal device 1. Therefore, in the storage unit 52A for AVI, the license plate number of the passing vehicle, its acquisition time, and the detected image type terminal device 1 (acquisition point) are stored in association with each other. Similarly, when vehicle information is transmitted from any of the wireless communication terminal devices 2 installed in the road network, the SP server 4 transfers this vehicle information to the integrated server 5. The integrated server 5 collects vehicle information of passing vehicles detected by each wireless communication terminal device 2 installed on the road network, and divides the vehicle information for each wireless communication terminal device 1 into vehicle information of detected passing vehicles. And the acquisition time are associated with each other and stored in the SP storage unit 52B. The integrated server 5 stores an installation point for each wireless communication terminal device 2. Therefore, the SP storage unit 52B stores the vehicle information of the passing vehicle, its acquisition time, and the detected wireless communication type terminal device 2 (acquisition point) in association with each other.

  Next, the average travel time calculation process in the integrated server 5 will be described. FIG. 16 is a flowchart showing an average travel time calculation process in the integrated server. The integrated server 5 executes this average travel time calculation process when an input operation related to the calculation of the average travel time is performed on the operation unit 54 or when a predetermined time is reached. The integrated server 5 determines between two points (upstream point and downstream point) of the road network for calculating the average travel time (s51). These two points are input by the operator using the operation unit 54 or set in the integrated server 5 in advance. When the integrated server 5 determines between the two points for calculating the average travel time, the integrated server 5 determines whether or not the wireless communication terminal device 2 is installed at the upstream point (s52). In s52, the wireless communication type terminal device 2 is installed at a point where both the image type terminal device 1 and the wireless communication type terminal device 2 are installed, or a location where only the wireless communication type terminal device 2 is installed. It is determined that it is a point. In other words, a point where only the image type terminal device 1 is installed is determined as a point where the wireless communication type terminal device 2 is not installed. If the integrated server 5 determines in s52 that the wireless communication type terminal device 2 is installed at the point, the information about the passing vehicle detected by the wireless communication type terminal device 2 installed at the point is averaged this time. It determines to the information used for calculation of travel time (s53). On the other hand, if it is determined in s52 that the wireless communication type terminal device 2 is not installed, the information about the passing vehicle detected by the image type terminal device 1 installed at that point is obtained as the current average travel time. It determines to the information used for calculation (s54). Further, the integrated server 5 determines whether or not the wireless communication terminal device 2 is installed at the downstream point as well as the upstream point (s55), and the wireless communication terminal device 2 is installed. If it is determined that it is a spot, the information about the passing vehicle detected by the wireless communication type terminal device 2 installed at the spot is determined as information used for calculating the average travel time this time (s56). On the other hand, if it is determined in s55 that the wireless communication type terminal device 2 is not installed, the information about the passing vehicle detected by the image type terminal device 1 installed at that point is obtained as the current average travel time. It determines to the information used for calculation (s57).

  The integrated server 5 is a memory allocated to the image-type terminal device 1 or the wireless communication-type terminal device 2 installed at the upstream point where the average travel time determined by the above process is calculated, and the downstream point. The storage area of the unit 52 is accessed, and the travel time for each passing vehicle that has passed both points is calculated (s58). In s58, for each passing vehicle detected at a downstream point within a certain time, for example, within the last 30 minutes, it is determined whether it is detected at an upstream point. Specifically, it is searched whether or not a passing vehicle having the same license plate number as that of the passing vehicle detected at the downstream point is detected at the upstream point. This search is performed on the storage area of the storage unit 52 allocated to the image type terminal device 1 or the wireless communication type terminal device 2 installed at the upstream point. And if it is a passing vehicle that is also detected at an upstream point, it is detected at the upstream point for that passing vehicle (number plate number or vehicle information acquisition time) and at the downstream point. The difference from the calculated time (number plate number or vehicle information acquisition time) is calculated as the travel time for the passing vehicle.

  When the integrated server 5 calculates the travel time for each passing vehicle detected at both the upstream side and the downstream side in s58, the integrated server 5 calculates the average travel time calculated for each passing vehicle as a temporary average travel time ( s59). The integrated server 5 extracts from the travel time of the passing vehicle calculated in s58, the travel time of the passing vehicle in which the difference from the temporary average travel time calculated in s59 is equal to or larger than a predetermined size (s60). ). For example, the travel time of a passing vehicle whose absolute value of the difference from the tentative average travel time is a certain time (for example, 30 minutes) or more is extracted. Alternatively, the travel time of a passing vehicle whose absolute value of the difference from the temporary average travel time is equal to or greater than a certain ratio (for example, 20%) with respect to the temporary average travel time is extracted. The integrated server 5 has the same travel time for passing vehicles that differ from a general vehicle in the travel mode between the two points for which the average travel time is calculated in s60, and the serial designation number described in the license plate 2. A travel time or the like that is erroneously calculated as the same passing vehicle is extracted. The integrated server 5 calculates the average of the remaining travel time as the average travel time of the vehicle between the two points, excluding the travel time extracted in s60 from the travel time calculated for each passing vehicle in s58. (S61).

  Thus, the integrated server 5 can calculate the average travel time of the vehicle between two points where at least one of the image type terminal device 1 or the wireless communication type terminal device 2 is installed. Therefore, the number of sections (between two points) where the average travel time can be calculated is larger than that of the existing AVI system, and the average travel time can be calculated more precisely. Even if the number of wireless communication terminal devices 2 installed on the road network is small, the smart plate 6 attached to the vehicle or the wireless communication terminal device 2 installed on the road network is used. It can be effectively used to calculate the average travel time between two points on the road network.

  Next, time adjustment processing in the integrated server 5 will be described. FIG. 17 is a flowchart showing time adjustment processing of the integrated server. The integrated server 5 executes this time adjustment process when a predetermined time is reached. The integrated server 5 reads the current time from the reference clock (s71), and sends a time adjustment command for instructing the time adjustment of the clock unit 13 of each image type terminal device 1 from the communication unit 51 to the AVI server 3 together with the current time read in s71. (S72). The reference clock may be a clock built in the integrated server 5 or a clock server (not shown) connected to the integrated server 5.

  When the AVI server 3 receives the time adjustment command transmitted by the integrated server 5 at s72, the AVI server 3 determines that the time adjustment instruction of the clock unit 13 of each image type terminal device 1 has been received at s12 described above, and sets the time according to s16. Execute the process. FIG. 18 is a flowchart showing time adjustment processing of the AVI server. The AVI server 3 returns the time (the time read from the reference clock in s71 by the integrated server 5) transmitted together with the time adjustment command received this time to the integrated server 5 (s91).

  When the integrated server 5 receives the reply from the AVI server 3 (s73), the integrated server 5 reads the current time from the reference clock (s74), and reads the time included in the reply from the AVI server 3 and the reference clock at s74. The difference from the current time is calculated (s75). In s75, the difference between the time read from the reference clock by the integrated server 5 in s71 and the time read in s74 is calculated. The integrated server 5 considers that the time calculated in s75 is twice the time required for communication with the AVI server 3. The integrated server 5 reads the current time from the reference clock again (s76), the time read from the reference clock in s76, and the half time (half time) calculated in s75 as the correction time, It is transmitted to the AVI server 3 together with the time setting command (s77).

  When the AVI server 3 receives the time setting command from the integrated server 5 (s92), the time of the built-in internal clock (not shown) is transmitted with the time setting command (the integrated server 5 receives the time setting command s76). To the time obtained by adding the correction time to the time read from the reference clock (S93). The AVI server 3 adjusts the time of the clock unit 13 of each image type terminal device 1 when the time of the built-in clock is adjusted in s93. The AVI server 3 sets the image type terminal device 1 that performs time adjustment of the clock unit 13 (s94). In s94, the image type terminal device 1 that has not performed time adjustment of the clock unit 13 at this time is set as the image type terminal device 1 that performs time adjustment of the clock unit 13. The AVI server 3 reads the current time from the built-in clock (s95), and transmits a time adjustment command for instructing the time adjustment of the clock unit 13 to the image type terminal device 1 set in s94 together with the current time read in s95 ( s96).

  When receiving the time adjustment command transmitted by the AVI server 3 at s96, the image type terminal device 1 determines that the time adjustment instruction from the clock unit 13 has been received at s2 described above, and executes the time adjustment process for s7. FIG. 19 is a flowchart showing time adjustment processing of the image type terminal device. The image type terminal device 1 returns the time (the time read from the internal clock in s95 by the AVI server 3) transmitted together with the time adjustment command received this time to the AVI server 3 (s111).

  When the AVI server 3 receives the reply from the image type terminal device 1 (s97), the AVI server 3 reads the current time from the built-in clock (s98), and the time included in the reply from the image type terminal device 1 is built in s98. The difference from the current time read from the clock is calculated (s99). In s99, the difference between the time read by the AVI server 3 from the internal clock in s95 and the time read in s98 is calculated. The AVI server 3 regards the time calculated in s99 as twice the time required for communication with the image type terminal device 1. The AVI server 3 reads the current time from the built-in clock again (s100), the time read from the built-in clock in s100, and the half time (half time) calculated in s99 as the correction time, It is transmitted to the image type terminal device 1 together with the time setting command (s101).

  When receiving the time setting command from the AVI server 3 (s112), the image-type terminal device 1 reads the time of the clock unit 13 together with the time transmitted with the time setting command (the AVI server 3 reads from the internal clock at s100). (S113). The image-type terminal device 1 ends this processing when the time of the clock unit 13 is set in s113.

  On the other hand, when the AVI server 3 transmits a time adjustment command to the image type terminal device 1 in s101, there is an image type terminal device 1 (unprocessed image type terminal device 1) that has not performed time adjustment of the clock unit 13 this time. (S102), if there is an unprocessed image type terminal device 1, the process returns to s94 and the above process is repeated. Further, when it is determined in s102 that there is no unprocessed image type terminal device 1, this processing is terminated.

  Thereby, the built-in clock of the AVI server 3 and the clock unit 13 of each image type terminal device 1 installed in the road network are set based on the reference clock.

  Further, when the integrated server 5 transmits a time adjustment command to the AVI server 3 in s77, the integrated server 5 performs the same processing as in s71 to s77 on the SP server 4. Specifically, the integrated server 5 reads the current time from the reference clock (s78), and communicates the time adjustment command for instructing the time adjustment of the clock unit 22 of each wireless communication terminal device 2 together with the current time read in s78. The data is transmitted from the unit 51 to the SP server 4 (s79).

  When the AVI server 3 receives the time adjustment command transmitted by the integrated server 5 in s79, the AVI server 3 determines that the time adjustment instruction of the clock unit 22 of each wireless communication terminal device 2 has been received in s32 described above, and the time taken for s35 Execute the matching process. FIG. 20 is a flowchart showing time adjustment processing of the SP server. The time adjustment process of the SP server 3 is the same process as the time adjustment process of the AVI server 3 described above. The AVI server 3 returns the time (the time read by the integrated server 5 from the reference clock in s78) transmitted together with the time adjustment command received this time to the integrated server 5 (s121).

  When the integrated server 5 receives the reply from the SP server 4 (s80), the integrated server 5 reads the current time from the reference clock (s81), and reads the time included in the reply from the SP server 3 and the reference clock at s81. The difference from the current time is calculated (s82). In s82, the difference between the time read by the integrated server 5 from the reference clock in s78 and the time read in s82 is calculated. The integrated server 5 considers the time calculated in s82 to be twice the time required for communication with the SP server 4. The integrated server 5 reads the current time from the reference clock again (s83), the time read from the reference clock in s83, and the half time (half time) calculated in s82 as the correction time, It is transmitted to the SP server 4 together with the time setting command (s84). When the integrated server 5 transmits a time setting command to the SP server 4 in s84, this processing ends.

  When the SP server 4 receives the time setting command from the integrated server 5 (s122), the time of the built-in internal clock (not shown) is transmitted along with the time setting command (the integrated server 5 receives the time setting command s83). To the time obtained by adding the correction time to the time read from the reference clock (S123). When the SP server 4 sets the time of the built-in clock in s123, the SP server 4 sets the time of the clock unit 22 of each wireless communication type terminal device 2. The SP server 4 sets the wireless communication terminal device 2 that performs time adjustment of the clock unit 22 (s124). In s124, the wireless communication type terminal device 2 that has not performed the time adjustment of the clock unit 22 this time is set as the wireless communication type terminal device 2 that performs the time adjustment of the clock unit 22. The SP server 4 reads the current time from the built-in clock (s125), and transmits the time adjustment command for instructing the time adjustment of the clock unit 22 to the wireless communication type terminal device 2 set in s124 together with the current time read in s125. (S126).

  When receiving the time adjustment command transmitted from the SP server 4 at s126, the wireless communication terminal apparatus 2 determines that the clock unit 22 has instructed the time adjustment at s22 described above, and executes the time adjustment process for s28. . FIG. 21 is a flowchart showing time adjustment processing of the wireless communication terminal device. The wireless communication type terminal device 2 returns the time (time read by the SP server 4 from the internal clock in s125) transmitted together with the time adjustment command received this time to the SP server 4 (s141).

  When the SP server 4 receives a reply from the wireless communication terminal device 2 (s127), the SP server 4 reads the current time from the built-in clock (s128), and includes the time included in the reply from the wireless communication terminal device 2 and s128. The difference from the current time read from the internal clock is calculated (S129). In s129, the difference between the time read by the SP server 4 from the internal clock in s125 and the time read in s128 is calculated. The SP server 4 considers that the time calculated in s129 is twice the time required for communication with the wireless communication type terminal device 2. The SP server 4 reads the current time from the built-in clock again (s130), the time read from the built-in clock in s130, and the half of the time calculated in s129 (half time) as the correction time. Along with the time setting command, it is transmitted to the wireless communication terminal device 2 (s131).

  When the wireless communication type terminal device 2 receives the time setting command from the SP server 4 (s142), the time of the clock unit 22 is transmitted from the built-in clock at the time the SP server 4 is transmitted together with this time setting command (s130). The time is adjusted to the time obtained by adding the correction time to (the read time) (s143). When the time of the clock unit 22 is set in s143, the wireless communication terminal device 2 ends this processing.

  On the other hand, when the SP server 4 transmits a time adjustment command to the wireless communication terminal device 2 in s131, the wireless communication terminal device 2 that has not performed time adjustment of the clock unit 22 this time (unprocessed wireless communication terminal device 2). ) (S132), and if there is an unprocessed wireless communication type terminal device 2, the process returns to s124 and repeats the above processing. Further, when it is determined in s132 that there is no unprocessed wireless communication terminal device 2, this processing is terminated.

  Thereby, the built-in clock of the SP server 4 and the clock unit 22 of each wireless communication type terminal device 2 are also adjusted based on the reference clock.

  Therefore, by this time adjustment process, the time of the clock unit 13 of each image type terminal device 1, the clock unit 22 of each wireless communication type terminal device 2, the built-in clock of the AVI server 3, and the built-in clock of the SP server 4 are all Adjusted based on the reference clock. As a result, it is possible to suppress a time lag between the clock unit 13 of each image type terminal device 1 and the clock unit 22 of each wireless communication type terminal device 2, and as a result, A shift in acquisition time when a passing vehicle in the clock unit 13 and each wireless communication terminal device 2 is detected can be suppressed. Therefore, the calculation accuracy of the average travel time of the vehicle between two points on the road network calculated by the integrated server 5 can be improved.

  In the above description, the integrated server 5 instructs the AVI server 3 to perform time adjustment processing and then instructs the SP server 4 to perform time adjustment processing. However, this order may be reversed. Good.

  Further, each image type terminal device 1 and each wireless communication type terminal device 2 are provided with a radio clock function so that the time is automatically adjusted at a predetermined timing, for example, 0:00 am. May be. In this way, the time adjustment process in the integrated server 5, the AVI server 3, and the SP server 4 described above can be made unnecessary.

  Next, the falsified vehicle detection process in the integrated server 5 will be described. FIG. 22 is a flowchart showing the falsified vehicle detection process of the integrated server 5. As described above, the integrated server 5 is wirelessly connected to the imaging terminal device 1 and the imaging area of the camera 11 of the imaging terminal device 1 and the wireless communication area of the wireless communication unit 21 of the wireless communication terminal device 2. The communication type terminal device 2 is stored in association with each other. When the integrated server 5 receives the license plate number or vehicle information relating to the passing vehicle detected by the image type terminal device 1 or the wireless communication type terminal device 2 (s151), the integration server 5 passes the license plate number or vehicle information received this time. The detected image type terminal device 1 or wireless communication type terminal device 2 is specified (s152). The integrated server 5 is one device in which the device specified in s152 (the image type terminal device 1 or the wireless communication type terminal device 2) overlaps the imaging area of the camera 11 and the wireless communication area of the wireless communication unit 21. It is determined whether or not there is (s153). If the integrated server 5 determines that the image capturing area of the camera 11 and the wireless communication area of the wireless communication unit 21 are not overlapped in s153, the process returns to s151.

  On the other hand, if the integrated server 5 determines in s153 that the imaging area of the camera 11 and the wireless communication area of the wireless communication unit 21 overlap each other, the integrated server 5 and the imaging of the camera 11 are identified in s152. The other device in which the area or the wireless communication area of the wireless communication unit 21 overlaps is specified (s154). The integrated server 5 searches the storage area of the storage unit 52 (the storage unit for AVI 52A or the storage unit for SP 52B) assigned to the device identified in s154, and the license plate number or vehicle information received in s151. It is determined whether the license plate number or vehicle information detected at substantially the same time as the acquisition time is stored (s155). The integrated server 5 corresponds to the acquisition time to the passing plate information detected by each image type terminal device 1 and the vehicle information of the passing vehicle detected by each wireless communication terminal device 2 by the passing vehicle information collecting process described above. Then, it is stored in the storage unit 52. In s155, it is searched whether or not a license plate number or vehicle information having an absolute value of the difference in acquisition time of about 1 second is stored. That is, it is determined whether or not the license plate number or vehicle information has already been received from the other device and stored in the storage unit 52 for the same passing vehicle as the passing vehicle related to the license plate number or vehicle information received in s151. Yes. If the integrated server 5 determines in s155 that the license plate number or vehicle information detected at approximately the same time as the acquisition time of the license plate number or vehicle information received in s151 is not stored, the process returns to s151.

  When the integrated server 5 determines that the license plate number or vehicle information detected at approximately the same time as the acquisition time of the license plate number or vehicle information received in s151 in s155, the passage detected in both devices is stored. It is determined whether the license plate numbers of the vehicles match (s156). In s156, the license plate number received in s151 or the license plate number included in the vehicle information matches the license plate number acquired in the search of s155 or the license plate number included in the vehicle information. Judgment is made. If the integrated server 5 determines that they match in s156, that is, the license plate number written in the license plate matches the license plate number stored in the smart plate 6, and the license plate and smart If it is determined that the passing vehicle has not been tampered with the plate 6, the process returns to s151.

  On the other hand, if the integrated server 5 determines that they do not match in s156, that is, if the integrated server 5 determines that the vehicle is a passing vehicle in which at least one of the license plate or the smart plate 6 has been tampered with, an output indicating that is output. (S157). In s157, the license plate number acquired by the image type terminal device 1 from the passing vehicle and its acquisition information, and the vehicle information acquired by the wireless communication type terminal device 2 and the acquisition information are displayed on the display unit 53. Further, a notification sound is output to notify the operator that a passing vehicle in which tampering has been performed on at least one of the license plate or the smart plate 6 has been detected. Thereby, the detection of the passing vehicle in which the license plate or the smart plate has been tampered with can be promptly transmitted to the operator. In addition, since the information about the number of the passing vehicle detected by the acquired information and the license plate number written on the license plate is also communicated to the operator, the inspection for detecting the passing vehicle with the falsified license plate or smart plate. Etc. can be quickly controlled. Therefore, it is possible to quickly detect a vehicle in which at least one of the license plate or the smart plate has been tampered with. In particular, a vehicle in which the license plate or the smart plate 6 has been tampered with is highly likely to be used for crimes, and the detection of such vehicles is promptly performed, thereby providing an effect of preventing crimes.

  Further, when a vehicle in which at least one of the license plate or the smart plate is altered is detected, the vehicle may be tracked.

  In the above embodiment, the AVI server 3, the SP server 4, and the integrated server 5 are configured as separate devices. However, the AVI server 3 and the SP server 4 are eliminated, and the image type terminal device 1 and the wireless communication type are used. The terminal device 2 may be configured to be directly connected to the integrated server 5.

  Further, the average travel time calculation process in the integrated server 5 in the above embodiment may be as follows. FIG. 23 is a flowchart showing an average travel time calculation process of the integrated server according to another embodiment. In FIG. 23, the same step number (s **) is assigned to the same process as the process shown in FIG. Here, the average travel time between two points on the road network is calculated, except for route buses, emergency vehicles, and the like, which are different in traveling form from general vehicles in the road network. In the integrated server 5, vehicle types that are not used for calculating the average travel time between two points on the road network are set in advance. The integrated server 5 executes the processes related to s51 to s57 shown in FIG. The integrated server 5 determines whether or not at least one of the upstream point where the average travel time determined in the above process is calculated or the device installed at the downstream point is the wireless communication terminal device 2 ( s161). If it is determined that both the upstream point where the average travel time is calculated in s161 or the device installed at the downstream point is the image type terminal device 1, the upstream point and the downstream side where the average travel time is calculated It is determined whether there is a point where the wireless communication type terminal device 2 is installed between the two points (s162). If the integrated server 5 determines that there is no point where the wireless communication terminal device 2 is installed between the upstream point and the downstream point where the average travel time is calculated in s162, s58 shown in FIG. Processes related to ˜s61 are executed. In this case, an average travel time that does not exclude route buses, emergency vehicles, and the like that are different from general vehicles in a predetermined road network is calculated.

On the other hand, when it is determined that both the upstream point where the average travel time is calculated in s161 or the device installed at the downstream point is the image type terminal device 1, or the upstream where the average travel time is calculated in s162 If it is determined that there is a point where the wireless communication type terminal device 2 is installed between the point location and a downstream side, a point upstream of calculating the average travel time, and the land point downstream passage The type of vehicle used for calculating the average travel time is extracted from the selected vehicles (s163). As described above, the vehicle information stored in the storage unit 61 by the smart plate 6 includes the type of vehicle. The vehicle information stored in the storage unit 61 of the smart plate plate 6 is read by the wireless communication terminal device 2 while the vehicle that has passed between the two points for calculating the average travel time is passed between the two points. Yes. Therefore, the integrated server 5 can recognize the type of vehicle (general vehicle, route bus, emergency vehicle, etc.) that has passed between two points for calculating the average travel time. Use the average upstream point for calculating the travel time, and even the vehicle which has passed through the land point downstream, the calculation of the type of vehicle (average travel time is not used in the calculation of the average travel time which is set in advance No type of vehicle) is extracted in s163. In s163, a passing vehicle detected at a downstream point within a certain time, for example, within the last 30 minutes, is targeted.

  The integrated server 5 calculates the travel time between two points for calculating the average travel time for each vehicle extracted in s163 (s164). After calculating the travel time for each vehicle extracted in s163, the integrated server 5 calculates the average travel time for each passing vehicle as the provisional average travel time (s165). The integrated server 5 extracts the travel time of passing vehicles whose difference from the temporary average travel time calculated in s165 is equal to or greater than a predetermined size (s165). The process according to s165 is the same as the process according to s60. The integrated server 5 removes the travel time extracted in s165 from the travel time calculated for each passing vehicle in s164, and calculates the average travel time of the remaining passing vehicles as the average travel time of the vehicle between the two points. (S166).

  This makes it possible to calculate the average travel time excluding route buses and emergency vehicles. In the above description, a preset type of vehicle is not used for calculating the average travel time. However, the average travel time for the type of vehicle may be calculated. For example, the average travel time may be calculated for a route bus. In addition, since the average travel time can be calculated for each type of route bus in this way, the delay of the route bus can be eliminated by performing signal control based on the average travel time.

  In the above embodiment, the integrated server 5 acquires the type of the vehicle from the vehicle information acquired from the smart plate 6. However, the license plate number and the license plate number for each route bus from the bus company operating the route bus, etc. Information regarding the operation mode of the route bus (forwarding, normal, express, route, etc.) may be acquired.

  Further, a wireless communication device may be attached to a vehicle such as a route bus or an emergency vehicle, and an operation mode or the like may be transmitted from the vehicle to the wireless communication type terminal device 2.

It is a figure which shows the structure of the travel time calculation system which is embodiment of this invention. It is a figure which shows the installation point of the image type terminal device in the road network of the travel time calculation system which is embodiment of this invention, and a radio | wireless communication type terminal device. It is a block diagram which shows the structure of the image type terminal device of the travel time calculation system which is embodiment of this invention. It is a figure which shows the installation state of the camera of the image type terminal device in a road. It is a figure explaining the number plate number described in the number plate. It is a block diagram which shows the structure of the AVI server of the travel time calculation system which is embodiment of this invention. It is a block diagram which shows the structure of a smart plate. It is a block diagram which shows the structure of the radio | wireless communication type terminal device of the travel time calculation system which is embodiment of this invention. It is a block diagram which shows the structure of SP server of the travel time calculation system which is embodiment of this invention. It is a block diagram which shows the structure of the integrated server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows operation | movement of the image type terminal device of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows operation | movement of the AVI server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows operation | movement of the radio | wireless communication type terminal device of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows operation | movement of SP server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the passing vehicle information collection process in the integrated server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the average travel time calculation process in the integrated server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the time adjustment process in the integrated server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the time adjustment process in the AVI server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the time adjustment process in the image type terminal device of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the time adjustment process in SP server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the time adjustment process in the radio | wireless communication type terminal device of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the falsified vehicle detection process in the integrated server of the travel time calculation system which is embodiment of this invention. It is a flowchart which shows the average travel time calculation process in the integrated server of the travel time calculation system which is another embodiment of this invention.

Explanation of symbols

1-Image type terminal device 2-Wireless communication type terminal device 3-AVI server 4-SP server 5-Integrated server 6-Smart plate 11-Camera 12-Image processing unit 13-Clock unit 14-Communication unit 21-Wireless communication unit 22-clock unit 23-communication unit 31-first communication unit 32-storage unit 33-second communication unit 41-first communication unit 42-vehicle information storage unit 43-second communication unit 51-communication unit 52-Storage unit 52a-AVI storage unit 52b-SP storage unit 53-Display unit 54-Operation unit 61-Storage unit 62-Wireless communication unit

Claims (6)

An image pickup unit that is installed at a plurality of points on the road network and picks up a license plate of a passing vehicle in an image pickup area; A plurality of first vehicle detections having license plate number output means for outputting the license plate number of the passing vehicle acquired by the image processing means together with acquisition related information including acquisition time and acquisition point of the license plate number Equipment,
Wireless communication means installed at a plurality of points on the road network and acquiring vehicle information including a type of a passing vehicle and a license plate number in a wireless communication area by wireless communication with a smart plate attached to the passing vehicle; A plurality of second vehicle detection devices having vehicle information output means for outputting the vehicle information of the passing vehicle acquired by the communication means together with acquisition related information including an acquisition time and an acquisition point of the vehicle information;
A plurality of the first vehicle detection devices collect and store the license plate number of the passing vehicle output by the license plate number output means and the acquisition related information relating to the acquisition time and acquisition point of the license plate number. Acquisition related information including first passing vehicle information storage means, vehicle information of passing vehicles output by the plurality of second vehicle detection devices by the vehicle information output means, and acquisition times and acquisition points of the vehicle information Based on the storage contents of the second passing vehicle information storage means, the first passing vehicle information storage means, and the second passing vehicle information storage means between the two points of the road network. Average travel time calculating means for calculating the average travel time of the vehicle,
The average travel time calculation means uses information on emergency vehicles and route buses that are predetermined vehicle types stored in the first passing vehicle information storage means and the second passing vehicle information storage means. A travel time calculation system comprising: a host device that calculates an average travel time of a vehicle between two points on the road network . The average travel time calculating means of the host device is only information on route buses that are predetermined vehicle types stored in the first passing vehicle information storage means and the second passing vehicle information storage means. The travel time calculation system according to claim 1, which also has a route bus travel time calculation function for calculating an average travel time of a route bus between two points of the road network. The host device includes a first vehicle detection device in which an imaging area of a license plate of a passing vehicle in the imaging unit and a wireless communication area of a smart plate attached to the passing vehicle in the wireless communication unit overlap. A determination means for determining whether or not the license plate numbers acquired from the same passing vehicle with the second vehicle detection device;
Wherein when the determination means determines that no match, travel time calculation system according to claim 1 or 2, comprising an output means for outputting to that effect, the. When calculating the average travel time of the vehicle between the two points where the first vehicle detection device is installed, the average travel time calculation means of the host device is installed at a point located between the two points. The travel time calculation system according to any one of claims 1 to 3, wherein a vehicle type is recognized using vehicle information of a passing vehicle acquired by the second vehicle detection device. A plurality of first vehicle detection devices installed at a plurality of points on the road network pick up the number plates of passing vehicles in the image pickup area with the image pickup means, and process the picked-up images picked up by the image pickup means with the image processing means. The license plate number of the passing vehicle is acquired, and further, the license plate number of the passing vehicle acquired by the image processing means is output to the host device together with the acquisition related information including the acquisition time and the acquisition point of the license plate number,
A plurality of second vehicle detection devices installed at a plurality of points of the road network wirelessly communicate with a smart plate attached to the passing vehicle with vehicle information including the type and number plate number of the passing vehicle in the wireless communication area. And the vehicle information of the passing vehicle acquired by the wireless communication means is output to the host device together with the acquisition related information including the acquisition time and the acquisition point of the vehicle information,
The host device collects the license plate number of the passing vehicle output from the plurality of first vehicle detection devices and the acquisition related information relating to the acquisition time and the acquisition point of the license plate number to obtain the first passing vehicle. The second passing vehicle is collected by collecting the vehicle information of the passing vehicle output from the plurality of second vehicle detection devices and the acquisition related information including the acquisition time and the acquisition point of the vehicle information. The average travel time of the vehicle between two points on the road network is stored in the information storage means, and the average travel time is calculated based on the storage contents of the first passing vehicle information storage means and the second passing vehicle information storage means. A travel time calculation method calculated by a calculation means,
In the host device, the average travel time calculation means stores the average travel time of the vehicle between two points on the road network in the first passing vehicle information storage means and the second passing vehicle information storage means. A travel time calculation method for calculating without using information on emergency vehicles and route buses that are predetermined vehicle types. In the host device, when the average travel time of the vehicle between the two points where the first vehicle detection device is installed is calculated by the average travel time calculation means, the average travel time is calculated at a point located between the two points. The travel time calculation method according to claim 5, wherein the type of the vehicle is recognized using the vehicle information of the passing vehicle acquired by the installed second vehicle detection device.

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