A traffic light is a signaling device used at road intersections to control the flow of vehicles and pedestrians. It typically has three colored lights: red for stop, yellow for caution, and green for go. These lights operate in a sequence to ensure safety and orderly movement. Modern traffic lights often include sensors or timers to adapt to traffic conditions. They are critical in maintaining traffic discipline and reducing accidents. Some advanced systems also integrate with smart city technologies for efficient traffic management. Traffic lights are essential for both urban and rural traffic systems.