2. Traffic signals are divided into: traffic lights, traffic signs, traffic markings and the command of traffic police.

3. Traffic signal is a traffic command measure used to allocate the right of way for traffic flow in time when traffic separation cannot be realized at road intersections. The function of traffic signals is to scientifically distribute the traffic rights of vehicles and pedestrians on the road, so that they can pass smoothly and orderly. The setting of traffic lights, traffic signs and traffic markings shall conform to the national standards.