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Undid revision 1050615611 by 182.185.254.99 (talk) spammy, and not even the correct type of senore
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These systems feature [[Ultrasonic sensor|ultrasonic]] [[proximity detector]]s to measure the distances to nearby objects via sensors located in the front and/or rear [[Bumper (automobile)|bumper fascias]] or visually minimized within adjacent grills or recesses.
 
The sensors emit acoustic pulses, with a control unit measuring the return interval of each reflected signal and calculating object distances.<ref>{{cite web|url=http://www.launch-techs.com/Support/Info/Benz-PTS.htm|title=Mercedes Benz Parktronic system (PTS)|access-date=2008-07-13|publisher=Launch Tech|archive-url=https://web.archive.org/web/20090501203847/http://www.launch-techs.com/Support/Info/Benz-PTS.htm|archive-date=2009-05-01|url-status=dead}}</ref><ref>{{cite web|url=https://legiongaragedoors.ca/how-to-fix-broken-garage-door-sensor/|title=Garage Door Sensor}}</ref> The system in turns warns the driver with acoustic tones, the [[frequency]] indicating object distance, with faster tones indicating closer proximity and a continuous tone indicating a minimal pre-defined distance. Systems may also include visual aids, such as LED or LCD readouts to indicate object distance. A vehicle may include a vehicle pictogram on the car's infotainment screen, with a representation of the nearby objects as coloured blocks.
 
Rear sensors may be activated when reverse gear is selected and deactivated as soon as any other gear is selected. Front sensors may be activated manually and deactivated automatically when the vehicle reaches a pre-determined speed — to avoid subsequent nuisance warnings.
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