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

for example, can detect vehicles without relying on visible light. Other technologies may have different lighting or visibility requirements.

Are traffic sensors always recording?
No. A sensor may simply detect vehicle presence or movement and send information to the traffic controller. Some video-based systems capture images, but their recording and data-storage practices depend on their purpose and configuration.

Can bad weather affect traffic sensors?
It can, depending on the technology. Heavy rain, snow, fog, dirt, or obstructions may affect some detection systems more than others. Radar-based equipment often performs differently from video-based systems in poor visibility.

Who installs and maintains