The red light in traffic signals is used to indicate that vehicles and pedestrians must stop to prevent collisions and ensure orderly movement at intersections. It is universally recognized as a signal to halt, based on the association of red with danger or caution. By stopping traffic at specific intervals, red lights provide a clear method to manage the flow of vehicles, especially at busy junctions, allowing other directions to proceed safely when it’s their turn. This system reduces the risk of accidents, ensures that different directions of traffic do not conflict, and gives pedestrians a safe opportunity to cross. The red light plays a crucial role in promoting road safety, efficiency, and smooth transportation networks.