Engineering | Science | Technology on Instagram: "Police use handheld LIDAR (laser) speed guns that fire rapid pulses of infrared light at a vehicle and measure how long each pulse takes to bounce back. By converting those tiny time-of-flight measurements into distance—and tracking how that distance changes over many pulses per second—the device calculates the vehicle’s speed with very high precision. Because the laser beam is narrow, LIDAR can target a single car (usually the license plate or b