Working principle of traffic lights

Traffic lights are equipped with induction control, and vehicle detectors are installed at the entrance of intersections. The timing scheme of traffic lights is calculated by computer or intelligent signal controller, which can be changed at any time with the traffic information detected by the detector.

The basic mode of induction control is single intersection induction control, which is referred to as single point control induction control for short. According to the different detector settings, single-point induction control can be divided into semi-induction control and full induction control.

The traffic system is regarded as an uncertain system, and its status can be continuously measured, such as traffic volume, stopping times, delay time, queue length and so on. , gradually understand and master the object, and use the difference to change the adjustable parameters of the system or generate a control.

Extended data:

history

/kloc-At the beginning of the 9th century, in Yorktown, central England, red and green clothes represented different identities of women. Among them, the woman in red said that she was married and the woman in green was unmarried.

Later, the carriage ran over people in front of the Parliament Building in London, England, and people were inspired by red and green clothes. 186865438+February 10, the first member of the signal lamp family was born in the Parliament Building Square in London.

The lamp post was designed and manufactured by Hart, a British mechanical teacher at that time. It was 7 meters high and hung with a red and green lantern-gas traffic signal lamp, which was the first signal lamp on the city street. At the foot of the lamp, a policeman with a long pole pulled the belt to change the color of the lantern at will.