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

example, a sensor may detect that several cars are waiting in a lane. It sends that information to the traffic signal controller, which can use it when deciding when to change the lights or how long to give a particular direction a green signal.

Other devices may monitor pedestrians, record traffic conditions, or transmit information between traffic equipment.

So, while a small white box might look mysterious, it is often part of the technology that helps an intersection operate safely and efficiently.

Why Are These Devices Installed on Traffic Signal Poles?
Traffic intersections are busy places. Cars, trucks, motorcycles, cyclists,