What is the primary function of traffic lights?

The primary function of traffic lights is to control the flow of traffic. Traffic lights are essential in managing how vehicles and pedestrians move at intersections and busy intersections. By providing clear signals (red, yellow, and green), they help prevent accidents by indicating when vehicles must stop and when they can proceed. This regulation of movement is crucial for maintaining order on the roads, allowing for safe merging and turning at intersections, and ensuring that all road users can navigate their routes effectively.

While providing directions for pedestrians is a secondary function, as traffic lights sometimes include signals specifically for walkers, the main role is still focused on overall traffic management. Monitoring vehicle speed is not a function of traffic lights, as they do not measure speed directly, and they are certainly not meant to serve as decorative features. Instead, their design and location are primarily functional, aimed at enhancing safety and efficiency on the roadways.