What’s the Purpose of That Little White Device on the Traffic Light Pole?

may avoid giving that direction unnecessary green time.

However, not all traffic lights work this way.

Some intersections use fixed-time signals that follow a predetermined schedule. Others use vehicle detection to respond to traffic demand. Many systems combine preset timing plans with detection information.

The exact behavior depends on the signal controller and the intersection’s design.

Why Do Some Traffic Lights Seem to Ignore Your Car?
Have you ever waited at a red light and wondered whether the traffic signal even knows you’re there?

There are several possible reasons.

Your vehicle may not be in the detection zone
Some sensors