Laser radar sends a quick burst of infrared light to a speeding car. The light is reflected back and the unit calculates, in nanoseconds, how long it took for the light to travel in each direction. Then, the unit transposes the information it received into the miles per hour of the target vehicle. Laser radar is an extremely accurate device and, it’s very easy for officers to use. All they have to do is point it at a moving vehicle and squeeze the trigger.
Officers simply point and pull the trigger.
The target vehicle’s speed is displayed in miles per hour.