Traffic lights are important devices used to control the flow of vehicles and pedestrians at intersections. They typically have three colors: red, yellow, and green. The red light means stop, the green light means go, and the yellow light warns drivers to slow down and prepare to stop. This system helps prevent accidents and keeps everyone safe on the road. When a traffic light changes, it helps organize the movement of cars and people. For example, when the green light is on, cars can move forward while pedestrians wait. This orderly system allows for smoother traffic flow and ensures that everyone can travel safely.