The primary purpose of a traffic signal is to manage and control vehicular and pedestrian movement at intersections and roadways. Traffic signals help organize traffic flow, ensuring that vehicles and pedestrians can navigate safely and efficiently. By using red, yellow, and green lights, these signals guide drivers when to stop, yield, or proceed. Well-timed traffic signals can reduce congestion, minimize accidents, and enhance overall road safety. Additionally, they can be adapted to accommodate pedestrian signals, bicycle lanes, and specific traffic conditions, further promoting orderly transportation in urban environments.