Traffic lights are an important part of traffic signals and the basic language of road traffic. The traffic signal consists of a red light (indicating no traffic), a green light (indicating permission to pass), and a yellow light (indicating warning). Divided into: motor vehicle signal lights, non-motor vehicle signal lights, pedestrian crossing signal lights, lane signal lights, direction indicator lights, flash warning lights, road and railway plane crossing signal lights. In November 2012, about 300 sets of traffic lights were upgraded at nearly 30 intersections in Beijing. The diameter of each wick was increased from 300 mm to 400 mm, which greatly improved the visibility of traffic lights and facilitated the driver's observation while driving.
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