What is the purpose of traffic signals?

The purpose of traffic signals is primarily to control the flow of traffic. Traffic signals are strategically placed at intersections and pedestrian crossings to manage the movement of vehicles and pedestrians in a way that maximizes safety and efficiency. By assigning right-of-way through the use of different colored lights—red for stopping, green for going, and yellow for caution—traffic signals help to minimize the potential for collisions and ensure that all road users can navigate these areas more safely.

Regulating vehicle speed and enhancing vehicle aesthetics, while relevant to other aspects of road safety and design, are not the primary functions of traffic signals. Similar distinctions can be made for limiting pedestrian access; while signals may influence how pedestrians cross streets, the main goal of traffic signals is to coordinate and manage the overall flow of vehicular and pedestrian traffic effectively.