Abstract: An improved traffic monitoring and evidence gathering device (10) is provided which can be mounted in a mobile monitoring vehicle (32) in order to monitor vehicle traffic speed and, when a speeding violation is detected, to generate a vehicle-identifying image (38) having date, time, vehicle speed and location information imposed thereon. The device (10) includes a speed detector (12) operably coupled with a camera (14) and global positioning monitor (16); the monitor (16) is also connected to camera (14). When a monitored vehicle's speed exceeds a predetermined magnitude, the detector (12) generates an output serving to initiate operation of the camera (14) and satellite monitor (16), and to deliver speed information to the camera (14). The camera (14) creates a vehicle-identifying image (38), and imposes on the image (38) the speed and position information.