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

responds: When appropriate, the system may provide or extend a green signal for that direction.

The important thing is that a sensor doesn’t usually make the traffic light change immediately. The controller still follows its programmed sequence and safety requirements.

For example, it must allow appropriate clearance intervals and avoid giving conflicting directions a green signal at the same time.

Are These Devices Red-Light Cameras?
This is one of the most common questions people ask when they notice a small device on a traffic signal pole.

The short answer is: not necessarily.

A vehicle detection sensor and a red-light enforcement