Why do traffic lights use timed cycles?
Short answer
Signals assign turns to different directions, helping vehicles and pedestrians move without collisions.
How it works
Signals assign time to different directions at an intersection, coordinating vehicle and pedestrian movements. Their control can respond to traffic, turning vehicles, or pedestrians, so signals do not all use the same cycle.
Key point
Signal timing is not meant to make every wait identical. It helps manage safety and traffic flow at a particular intersection. Follow the signal and continue to watch for surrounding traffic.