What is the primary function of traffic signals?

The primary function of traffic signals is to control the flow of traffic. Traffic signals are strategically placed at intersections and pedestrian crossings to regulate the movement of vehicles and pedestrians. Their key purpose is to maintain an orderly progression of traffic, minimizing accidents and ensuring safety for all road users.

By controlling when vehicles can proceed or must stop, traffic signals help manage the often complex interactions between vehicles coming from different directions. The lights signal to drivers when to move, stop, or yield, facilitating smoother traffic flow and allowing for safe pedestrian crossings. This function is essential in busy areas where multiple roads intersect, ensuring that traffic moves efficiently while reducing the risk of collisions.

Indicating speed limits serves a different function, focusing on how fast vehicles should travel, rather than directing when they can move. Communicating driver intentions is relevant in specific contexts, like using turn signals, but is not the primary role of traffic lights. Providing directions can be important for navigating roadways, yet is distinct from the core responsibility of traffic signals.