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.
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 so as to prevent a traffic accident.
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.
Motor traffic lights and non-motorized traffic lights
Motor vehicle signal light is a set of lights composed of three unpatterned circular units in red, yellow and green to guide the passage of motor vehicles.
Non-motorized traffic lights are a set of lights consisting of three circular units in red, yellow, and green with a bicycle pattern to guide non-motorized vehicles.
When the green light is on, vehicles are allowed to pass, but vehicles turning around shall not interfere with the passing vehicles and pedestrians being released.
When the yellow light is on, the vehicle that has passed the stop line can continue to pass.
When the red light is on, no traffic is allowed.
In the absence of non-motorized traffic lights and crosswalk lights at the junction, non-motorized vehicles and pedestrians should be in accordance with motor vehicle traffic lights instructions.
When the red light is on, the right-turning vehicle can pass without impeding the release of vehicles and pedestrians.
A set of lights consisting of a red pedestrian standing pattern and a green pedestrian walking pattern guide pedestrian traffic.
When the green light is on, allow pedestrians to cross the pedestrian crossing.
When the red light is on, pedestrians are prohibited from entering the pedestrian crossing, but those who have entered the pedestrian crossing may continue to pass or wait at the centerline of the road.
The Shaanxi Yiyuan Traffic Technology Engineering Co.Ltd.
Address: No. 5, Production Ro ad, West Thermal Power Plant, West Section Of Hongguang Road, Weiyang District , Xi'an,Shaanxi.China
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Shaanxi Yiyuan Traffic Technology Engineering Co.,Ltd
Address: No.5, Production Road, West Thermal Power Plant, West Section Of Hongguang Road, Weiyang District, Xi'an, Shaanxi, China