Automatic license plate readers (ALPRs) are nothing new, but reported abuses have made drivers understandably wary of the cameras made by Flock and other companies, to the point of wanting to find out where they are so they can be avoided. While that added attention has made intersection cameras seem more visible than ever, not every camera you see mounted above the road serves the same purpose. Most cameras on roadways aren't used to track individual drivers, but rather to monitor traffic conditions.

Aside from ALPRs, cameras meant to track people running red lights are also controversial. They're banned in many states, and they're rare even where they're allowed. Far more common are cameras used to monitor traffic conditions in real time or automatically control traffic lights.

Distinct from cameras used to catch drivers speeding or running red lights, traffic cameras aren't designed to capture evidence for law enforcement. Instead, they're meant to be watched live to monitor the current state of traffic and keep an eye out for accidents. This real-time data can be used by local transportation departments to help keep traffic moving, by overriding automatic light timings in some cases, or to alert first responders when needed. These systems can also be used to track traffic patterns over time, helping traffic engineers determine when changes need to be made to roadways or signals to control congestion.

In many cases, the cameras mounted on traffic lights are tied to automatic signaling systems rather than providing a live video feed.

Source link