What is the purpose of traffic signals?

Traffic signals are primarily designed to control the flow of traffic at intersections and roadways. Their main purpose is to ensure safe and efficient movement of vehicles and pedestrians. By regulating when vehicles and pedestrians can go, stop, or yield, traffic signals help prevent accidents and collisions caused by confusion or lack of order on the road.

For instance, when a light is red, it indicates to drivers that they must stop, allowing pedestrians to cross safely. Conversely, when the light turns green, it signals to drivers that they can proceed, helping to manage the overall movement of traffic. This organized system is essential for maintaining safety on the roads, especially in busy areas with high traffic volumes.

Other options, such as entertaining drivers or displaying advertisements, do not align with the fundamental purpose of traffic signals, which is focused on safety and traffic management. Therefore, controlling the flow of traffic is the central and most critical function that helps facilitate the orderly movement of all road users.