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

an intersection.

Some sensors use radar, while others use infrared or other detection technologies. Depending on their design, they may be mounted on a pole, traffic signal mast arm, or another nearby structure.

When a vehicle enters the sensor’s detection area, the equipment sends information to the traffic signal controller.

That information can help the signal system decide whether a traffic phase is needed or whether its timing should be adjusted.

Why does this matter?

Imagine you’re sitting at a red light on a quiet side street while traffic continues moving along the main road. A vehicle detection system may