JPS5922197A - Control of traffic signal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for traffic signals, that is, road signals.More specifically, the present invention relates to a control method for traffic signals, that is, road signals. Traffic lights and variable signs are installed at predetermined intervals in the direction in which cars are coming from in front of the bridge, as well as speed detectors that detect the speed of cars traveling toward the bridge. If the wind speed exceeds the specified speed, the above traffic lights will be switched from "green" to "red" and
This system is characterized by controlling the variable sign based on the speed of the vehicle detected by the speed detector to prohibit vehicles from passing over the bridge.

For example, unlike bridges on land, long bridges built over the ocean are easily affected by wind, and therefore, if the wind speed is extremely high, it may be dangerous for vehicles to drive, and it may be better to stop driving altogether. There is.

This invention proposes a signal control method that focuses on such problems, and will be explained below using the drawings.

In Figure 1, (1) is a road, (2) is a bridge such as a long bridge, and (3) is an anemometer (for example, an ultrasonic anemometer) attached to the bridge, and only one is shown here. , it is needless to say that two or more are provided at predetermined intervals depending on the length of the bridge. (4) is a controller that is connected to the speed detector S such as the anemometer and the well-known radar speedometer and controls the traffic lights and signs described later, and has a function such as a microcomputer with calculation and control functions. It is mainly composed of elements and outputs a control signal On when the wind speed measured by the anemometer (3) exceeds a predetermined wind speed. (5) is the base of the bridge (2) (
6) is a traffic light installed at a distance VV, i in the direction of arrival of the vehicle, and (7) is limited by a variable sign installed at a distance of 12 from traffic light (5) in the direction of arrival of the vehicle. Variable speed display. (8) is a variable sign installed at a position a distance away from sign (7) in the direction of arrival of the vehicle.

In addition, Jl: J2 engineering! Not limited to the relationship 3, zl<z2<m.

Or 11 == 12 (Various road conditions such as straight roads, curves, and areas where crosswinds are required, such as i3).

Determined by the surrounding environment etc. (9) is a car traveling in the direction of the arrow.

The speed detector S is installed at a predetermined distance from the sign (8) located farthest from the bridge in the direction of the arrival of the vehicle. ) and gives a detection signal to the controller (4). In response to this detection signal, the controller issues a speed limit sign signal corresponding to the speed of the vehicle at sign R (force (8)K. In other words, the speed limit is determined based on the actually measured speed and the distance at the traffic light (5). is determined as the braking distance.

In such a configuration, if there is no 2 strong wind, the traffic light (5
) is always 1-blue”, and signs (7) and (8)
is marked as the maximum speed of the expressway (for example, 50 kJn/h). In such a situation, if the wind becomes strong and the wind speed measured by the anemometer (3) exceeds a predetermined wind speed, the controller (4) outputs a control signal 01 and the controller (4) outputs a control signal 01, causing the vehicle to drive on the road (11) In order to stop the oncoming car (9), the traffic light (5) is switched from "green" to "red" and the signs (7) and (8) are controlled according to the output of the speed detector described above.

In other words, the control signal OI turns the traffic light (5) "red".
At the same time, the speed indicator of sign (7) is changed to 101, for example.
yr/h.

For example, the speed indicator of sign (8) is s o 7. , /h. More specifically, the speed of the vehicle is reduced in stages before the traffic light (5).

In addition, it is not necessary to say that in order to do this, the distance of the phantom, J, must be sufficient to cope with the speed drop, taking into consideration the braking distance.

Next, examples of the configuration of signs (7) and (8) are shown in Figures 2, 3, and 4.
This will be explained using figures.

FIG. 2 shows an example of the structure of a sign. 00 is a front panel made of opaque sheet glass or plastic, except for the dot θ2 (transparent or opaque), which is the minimum unit of display characters, etc. Reference numeral 13 denotes a round bar-shaped light guide which forms one dot or a plurality of light guides, which is made of transparent plastic, has flexibility, and is made to correspond to each transparent or translucent dot α. Furthermore, Dora 10
It is the smallest unit of a character symbol or figure (picture), which will be explained later. One end of the light guide is fixed to a portion of the front plate 0υ near the dot α, and the other end is located near the light generator θ.

That is, the light generating device I is composed of a light source (for example, a logen lamp) α and a reflector (REFLECTOR) that reflects the light emitted from the light source (149), and the other end of the light guide (13) is It is located at the focal point of the reflector 0e.

Therefore, when the light source θ9 is turned on by power from the power source αη, the light enters from the other end of the 0th floor of the light guide and reaches one end. This is an example of a case where the speed is actually displayed, that is, a number.

Fig. 4 shows a sign constructed as shown in Figs. 2 and 3 with a means for changing the sign added, αυ is a front plate, and (13-1) to (13-n) are light guides.

0 is a light generator, 09 is a light source, θQ is a reflector, αD is a power supply, (18-1) to (18-n) are optical switches, and the respective light guides (13-1) to (13 -n)
They are provided in the middle and are selectively controlled by the selection circuit O1.

(4) is a controller, and the selection circuit 0! is controlled by a signal generated from the controller (4) when the wind speed exceeds a predetermined value. I selects and controls the optical switch. Therefore, if the controller (4) outputs the control signal αG, 2
The selection circuit α■ selects an optical switch to display a speed limit display lower than the normal speed display.

It is possible to display the speed at which the vehicle should decelerate at the stop sign (7) and (8), taking into account the braking distance relative to the actual value, in order to stop the oncoming vehicle before the 4th traffic light (5).

Since this invention is as described above, in the case of strong winds,
When it is extremely dangerous for a vehicle to cross a bridge, the speed of the vehicle driving toward the vehicle can be gradually reduced according to the instructions of the sign and stopped before the bridge, thereby preventing an accident from occurring. It can be prevented.

In the above embodiment, a round rod-shaped light guide made of transparent plastic was used as an example.

It goes without saying that this may be replaced with an optical fiber.

By the way, as in the embodiment, the light guide and the light source.

Signs that combine reflectors consume less power than conventional signs that use a light source and two display masks (representing the shape of displayed characters, etc.), and can be used even when the light source is not energized. It is possible to eliminate the illusory image that tends to occur (a phenomenon in which the light source in conventional signs appears to be lit due to sunlight reflected on the display mask surface even though it is not lit under bright sunlight).
This is an extremely easy-to-see sign for drivers and others.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a diagram for explaining the signal control method according to the present invention, and FIGS. 2 to 4 are diagrams showing examples of signs used in the present invention. Road, (2) is a bridge, (3)
ld anemometer, (4) is the controller, (5) is the traffic light, (6)
is the base of the bridge, (force (8) is the sign, (9) is the car, oI is the control signal, αυ is the front plate, 02 is the dot, u is the light guide, αa is the light generator 2G, and the seagull is the light source, (1e ke reflector, o7) is the power supply,
Ql is an optical switch, 01 is a selection circuit, and S is a speed detector. Note that the same or corresponding parts in the two figures are designated by the same reference numerals. Agent Makoto Kuzuno - - Figure 1, Figure 2, Figure 2, Figure 4

Claims (1)

[Claims] In addition to installing an anemometer on a bridge where cars can pass, a traffic light that can switch between [blue] and [red] is installed at a predetermined distance from the front of the bridge in the direction of arrival of cars. . A plurality of switchable speed limit signs are placed at a predetermined interval in the direction of arrival of vehicles at a predetermined distance from the traffic light, and from the sign installed at the farthest position from the traffic light. A vehicle speed detector is placed at a predetermined distance in the direction of arrival of the vehicle, and if the wind speed measured by the anemometer exceeds a preset wind speed, the traffic light is turned 1 green. Switch from 1 to 1 red. Based on the speed of the vehicle traveling toward the bridge detected by the above-mentioned traveling speed detector, the sign located farthest from the bridge is switched to a speed limit lower than the maximum speed of the road including the bridge, and this sign The other signs located between the traffic light and the above traffic light are changed to a lower speed limit than the sign located farthest from the bridge, and the speed of vehicles traveling towards the bridge is gradually reduced. A traffic signal control method characterized in that the traffic signal is lowered to a stop in front of the traffic signal to prevent cars from entering the bridge.