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Traffic Light
Apr 16, 2014

Development History

    In 1858, red and blue mechanical wrenches were installed on the main streets of London in the United Kingdom to direct the use of coal gas as a light source. This is the earliest traffic light in the world. In 1868, British mechanical engineer Nayette installed the world's first gas traffic light on the square in front of the parliament building in Westminster, London. It consists of red and green two rotating square glass lanterns, red, "stop", green, "attention." On the 23rd day of its operation, the gas lamp suddenly exploded and one of the police officers was killed on the spot and was canceled.


traffic light color order.jpg

In 1914, an electrically activated traffic light appeared in the United States. This traffic light consists of a red, yellow and green round light projector mounted on a tower on 5th Avenue in New York City. Red light means "stop" and green light means "pass".

In 1918, another traffic lights with control and infrared traffic lights appeared. Traffic lights with control, one is to put the pressure detector in the ground, the vehicle becomes a green light close to the red light; the other is to use a megaphone to start the traffic light, the driver hit the red light when the horn, so that The red light turns green. Infrared Traffic Light When a pedestrian embarks on a pressure-sensitive road, it can detect that someone is crossing the road. The infra-red beam can prolong the red light of the traffic light for a period of time and delay the release of the vehicle to prevent a traffic accident.

different types of traffic lights .jpg

The emergence of signal lights, traffic control can be effective for the ease of traffic flow, improve road capacity, reduce traffic accidents have a significant effect. In 1968, the UN Agreement on Road Traffic and Road Signs signals the meaning of various lights. The green light is a traffic signal and the vehicle facing the green light can go straight, left and right, unless the other sign prohibits a certain turn. Vehicles turning left and right must give priority to vehicles that are legally traveling in the intersection and pedestrians crossing the pedestrian crossing. The red light is a forbidden signal, and the vehicle facing the red light must stop after the stop line at the intersection. The yellow light is a warning signal and the vehicle facing the yellow light can not cross the parking line, but the vehicle is very close to the parking line and can not enter the intersection safely. Since then, this provision has become universal in the world.

Red green traffic light.jpg


The Shaanxi Yiyuan Traffic Technology Engineering Co.Ltd. 


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  • Shaanxi Yiyuan Traffic Technology Engineering Co.,Ltd

    Tel: +86-29-88270591

    E-mail: sxyyjt@sx-yyjt.com

    QQ: 1829090767

    Zip: 710065

    Address: No.5, Production Road, West Thermal Power Plant, West Section Of Hongguang Road, Weiyang District, Xi'an, Shaanxi, China

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