Toyota will demonstrate its infrastructure-linked driving safety support systems at a public display of intelligent transport systems technologies sponsored by the Universal Traffic Management Society of Japan (UTMS) in Toyota City, from 21-23 April.

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The TMC systems are aimed at helping drivers notice red lights; start away promptly after stops; notice stop signs; avoid rear end collisions; and notice pedestrians crossing the street.


Toyota said the systems help reduce the possibility of accidents by using infrastructure-vehicle communications to reach beyond the limits of a vehicle’s autonomous safety systems (such as onboard radar devices and cameras). As an environmental measure, they are also aimed at improving traffic flow.


The systems were evaluated in public-road tests sponsored by UTMS Japan and carried out in Toyota City from December 2008 to March 2009, based on the new IT reform strategy outlined in January 2006 by the Japanese government’s IT strategic headquarters. Those tests were part of the broader ITS-Safety 2010 intelligent transport systems testing programme in Aichi Prefecture (sponsored by Japan’s private-public ITS Promotion Council) aimed at achieving practical application of vehicle infrastructure cooperative systems in the year ending March 2011.


Based on its ‘integrated safety management concept’, TMC, in addition to developing onboard autonomous safety devices and systems, is promoting development of infrastructure-respondent systems that allow vehicle-to-vehicle and vehicle-to-infrastructure information exchanges using intelligent transport systems technologies.

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TMC said it is also participating in the creation of a safe traffic environment and conducting traffic safety awareness activities “to help realise the complete elimination of traffic casualties”.


How it works:



  • Road-to-vehicle system for helping drivers notice red lights – traffic-light status is sent to the vehicle from an optical beacon installed on the roadside. The driver is alerted when the light is red. If there is a possibility that the driver may run the red light, the system issues further alerts.

  • Road-to-vehicle system for helping drivers timely start from stop – traffic light status is sent to the vehicle from an optical beacon installed on the roadside. When a vehicle is stopped at a red light, the system displays the approximate remaining time before the red light turns green. The system also changes its display at a predetermined time before the light turns green to prompt the driver to prepare to accelerate, thus assisting in timely starts from stop.

  • Road-to-vehicle system for helping drivers notice stop signs – stop-sign information is sent to the vehicle from an optical beacon installed on the roadside. The system alerts drivers to the presence of an intersection requiring them to come to a complete stop before proceeding. If there is the possibility that the driver will not stop, the system further alerts the driver to the stop sign.

  • Road-to-vehicle system for helping drivers avoid rear-ending other vehicles – information regarding a vehicle ahead that has stopped or is travelling at a very low speed is sent to the vehicle travelling behind it by an optical beacon installed on the roadside. The system alerts the driver to the presence of the slow or stopped vehicle ahead.

  • Road-to-vehicle system for helping drivers notice pedestrians crossing the street – information indicating pedestrian crossings, pedestrians and or bicycles in close proximity is sent to the vehicle by an optical beacon installed on the roadside. When the driver makes a turn, the system alerts the driver to the presence of the pedestrians or bicycles.