Traffic signals are devices used to control the flow of vehicles and pedestrians at intersections. They typically use colored lights—red for stop, green for go, and yellow for caution—to communicate when it is safe to proceed or when to halt. These signals help prevent accidents and ensure smooth traffic movement. Traffic signals are often found in urban areas and are strategically placed to manage busy roads. They can be operated manually by traffic police or automatically through timers and sensors. In addition to lights, some signals may include pedestrian crossings and turn signals to enhance safety for all road users.