Traffic lights are signaling devices used at intersections to control the flow of vehicles and pedestrians. They typically have three colored lights: red, yellow, and green. The red light indicates that vehicles must stop, the green light means they can go, and the yellow light warns that the signal is about to change. These lights help maintain safety and order on the roads. They are often placed at busy intersections, where traffic can become congested. By following the signals, drivers and pedestrians can navigate safely, reducing the risk of accidents and ensuring smooth movement through urban areas.