Traffic lights, also known as traffic lights or three color traffic lights, they are important tools in road traffic management, designed to strengthen road traffic management, reduce the occurrence of traffic accidents, improve road use efficiency, and improve traffic conditions. It is suitable for intersections such as crosses and T-shaped intersections, and is controlled by road traffic signal controllers to guide vehicles and pedestrians to pass safely and orderly.

Traffic lights usually consist of red lights, green lights, and yellow lights, among which red lights indicate no passage, green lights indicate passage is allowed, and yellow lights indicate warnings. In addition, traffic lights also include motor vehicle lights, non-motor vehicle lights, pedestrian crossing lights, direction indicator lights (arrow lights), lane lights, flashing warning lights, road and railway level crossing lights, and other types.