A red light camera is a type of traffic enforcement camera that captures an image of a vehicle which has entered an intersection in spite of the traffic signal indicating red (during the red phase). By automatically photographing vehicles that run red lights, the photo is evidence that assists authorities in their enforcement of traffic laws. Generally the camera is triggered when a vehicle enters the intersection (passes the stop-bar) after the traffic signal has turned red.

Currently, there are over 150 red light cameras operated by the participating municipalities. In Toronto alone, 77 red light cameras are in operation. Changing driver behaviour, reducing collisions and saving lives are the key reasons the cameras are used.