What is the primary function of traffic lights?

The primary function of traffic lights is to control the flow of traffic. Traffic lights are strategically placed at intersections and pedestrian crossings to manage the movement of vehicles and pedestrians safely and efficiently. By using different colors—red, yellow, and green—traffic lights convey specific instructions to drivers. A red light means stop, a green light indicates that vehicles can proceed, and a yellow light serves as a warning that the light is about to change.

The design and timing of traffic signals are essential for ensuring smooth traffic flow, minimizing congestion, and preventing accidents. Properly functioning traffic lights help maintain order on the roads by giving clear instructions to road users, thus reducing confusion and potential collisions at intersections.

In contrast, while traffic lights play a role in managing traffic, they do not indicate road closures, which would require different signage or barriers. They also do not provide directions or signal speed limits as these are typically assigned via road signs rather than traffic lights.