Abstract: This paper addresses the heightened risk of rear-end collisions associated with insufficient vehicle spacing during high-speed driving. In response, traffic authorities have introduced an electronic police system equipped with cameras to identify vehicles failing to maintain a safe following distance. Despite the system's technological advancements, China currently lacks specialized measurement and testing equipment for its calibration and maintenance. This study proposes a novel laser-based device, integrating a laser rangefinder and a speedometer, to accurately determine the distance between vehicles and their speed. The data, including distance, speed, and time, are displayed on an LED screen installed in the test vehicle. This information is captured by the electronic police system to assess discrepancies between the LED display and the system's measurements. The device aims to offer robust evidence for law enforcement and encourage safer driving practices, thereby enhancing road safety.