Traffic lights are signals that direct traffic flow, generally consisting of red, green, and yellow lights. A red light indicates "stop," a green light indicates "go," and a yellow light indicates "warning."
Traffic lights are categorized as follows: motor vehicle traffic lights, non-motor vehicle traffic lights, pedestrian crossing traffic lights, directional indicator lights (arrow lights), lane traffic lights, flashing warning traffic lights, and level crossing traffic lights.
At intersections, red, yellow, and green traffic lights are displayed on all four sides; they are silent "traffic police." Traffic lights are internationally standardized. A red light is a stop signal, and a green light is a go signal. At intersections, vehicles from several directions converge; some want to go straight, some want to turn. Determining who has priority is determined by obeying the traffic lights. When the red light is on, it is forbidden to go straight or turn left. Vehicles are allowed to turn right if it does not obstruct pedestrians and other vehicles. When the green light is on, vehicles are allowed to go straight or turn. When the yellow light is on, vehicles must stop within the stop line or pedestrian crossing at the intersection. Vehicles that have already crossed the stop line may continue to pass. When the yellow light is flashing, it warns vehicles to pay attention to safety.
