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Radar guns have been used by police for more than 50 years, and as radar detectors have improved, law enforcement agencies have added lidar guns to their arsenal. Lidar, a technology used to create 3D topographic maps, sends out a laser beam which can be directed at a single object to detect its speed within 1.9 miles per hour. In addition, a lidar beam can capture a vehicle's license plate and even an image of the driver.
Lidar creates problems for most radar detectors. While some are tuned to be able to detect laser-based speed guns, many do not provide adequate warning for a driver to slow down. To combat the power and effectiveness of lidar, a number of manufacturers have come up with technologies that can absorb the lidar laser beam and nullify its ability to detect speeders.
These anti-lidar solutions are independent of the radar detector device; they are polymers that can be applied to a car’s headlights or other parts of the front grill. In many states, such laser jammers are illegal because of safety issues with laser beams.
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A radar detector is an in-car device that identifies many of the radar guns used by law enforcement to measure the speed of a passing car. Using the Doppler shift, a radar gun measures the distance and speed between the electromagnetic beam sent out by the handheld gun to a passing car and then back to the device.