The road traffic lights are used to allocate effective traffic rights to conflicting traffic flows each other, which is to improve road traffic safety and a class of traffic lights of road capacity. It is divided into two types. One is given a directional signal and displayed the traffic control lights of a single color such as red and green lights, the other indicates specific content such as pedestrian walk and stop (indicated by arrow), the direction of the vehicle and so on and the traffic lights with symbol. The road lights are a group of lights that is made of red, yellow, green three non-pattern round units, which is in order to guide the orderly passage of motor vehicles and pedestrians. The traffic lights are international uniform traffic lights.
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