What is the primary purpose of traffic signals?

The primary purpose of traffic signals is to manage the flow of traffic at intersections. Traffic signals are crucial for maintaining order and safety on the road by regulating when vehicles and pedestrians are allowed to enter an intersection. By using red, yellow, and green lights, traffic signals provide clear instructions to drivers, helping to prevent accidents and ensure smooth traffic flow. This orderly management reduces confusion at busy intersections, allowing for a systematic approach to navigating shared roadways.

While guiding pedestrians across the street is a function of specific traffic signals (like pedestrian signals), it falls under the broader category of traffic management at intersections. Information about road work or providing entertainment is not a primary function of traffic signals, which are designed specifically for the safe and effective control of traffic.