Editing Traffic enforcement camera (section)

===Speed limit enforcement===
{{Main|Speed limit enforcement}}
Speed enforcement cameras are used to monitor compliance with [[speed limits]], which may use [[Doppler radar]], [[LIDAR]], [[Computer stereo vision|stereo vision]] or [[automatic number-plate recognition]].<ref>{{cite web|url=https://www.cam2vision.com/technology-and-capability/comparison-of-speed-metering-technologies/|title=cam2vision - Technology and Capability - Tech Compare|website=cam2vision|language=en-US|access-date=2019-10-02}}</ref> Other speed enforcement systems are also used which are not camera based.

Fixed or mobile speed camera systems that measure the time taken by a vehicle to travel between two or more fairly distant sites (from several hundred meters to several hundred kilometers apart) are called average speed cameras. These cameras time vehicles over a known fixed distance, and then calculate the vehicle's average speed for the journey.