Video red light cameras are very effective at monitoring many vehicles in many lanes, at one time. Large amounts of data and red light running vehicles can be managed and recorded simultaneously. This allows very little opportunity for the camera to be "busy" processing one red light camera offense at a time. Video red light cameras are preferred when dealing with a large volume of vehicles and multiple lanes. They compare the current frame of video with the previous one continuously. This allows the processor to determine any vehicle's rate of speed and likelihood to run a red light. Another key function to video red light cameras is their own unique trigger mechanisms.
Detection placement of trigger zones are done by using interactive graphics, a mouse and drawing on screen detection lines along or across the roadway lanes. The person setting up the video camera's detection lines and trigger zones must ensure that the traffic scene within the field of view will be accurate. The red light video camera's angle should properly coincide with their detection lines and zones overlayed on the intersection scene. If the red light video camera is even slightly bumped or tilted in any way, it can accidentally move the detections zones multiple feet from their original set position. This will result in the issuing of inaccurate red light camera tickets. One main benefit of a video red light camera system is the trigger for the red light camera is integrated. There is no need to set up induction loops underneath asphalt. The triggers or detection zones can be reconfigured at any point in the future because they are done on screen of the video red light camera's GUI.