What is the main purpose of traffic signals?

The primary purpose of traffic signals is to control the flow of traffic at intersections. Traffic signals are strategically placed at intersections to manage the movement of vehicles and pedestrians, helping to prevent collisions and ensure that traffic flows smoothly and efficiently. By signaling when vehicles should stop and go, traffic lights create an organized system that promotes safety for all road users. This is essential in busy areas where unregulated traffic could lead to chaos and increased risk of accidents.

While the other options mention aspects related to road use, they do not capture the fundamental role of traffic signals. Parking space management is unrelated to traffic signal functionality, and pedestrian safety is one aspect of their purpose but not the sole focus. Indicating speed limits pertains to different road signage rather than traffic lights, which are specifically designed to manage intersection control. Thus, controlling traffic flow is the overarching reason why signals are essential to road safety and efficiency.