Manufacturers of the devices recommend calibration before every use, but states may require testing and calibration much less frequently. Radar guns, for example, require the use of a tuning fork to make sure that the device is producing accurate readings. Regardless of which technology the agency uses, these devices are sensitive tools of measurement that require regular calibration and adjustment. Law enforcement agencies have also begun moving towards Light Detection and Ranging (LIDAR) technology, which operates in much the same way as radar, but using lasers instead of radio waves. Using what is known as the Doppler Effect, the device can calculate the speed of the vehicle based on changes in the value of the returning signal. They work by directing a radio signal towards a vehicle, then receiving the same signal as it bounces off the vehicle. Radar guns are devices that both send and receive radio signals. Any challenge will be an uphill battle, however. If you have been pulled over for speeding based on the information from a radar gun, it’s possible to challenge the radar gun evidence in court based on the limitations inherent to radar guns. Radar guns are useful tools for detecting vehicles exceeding the speed limit, but, like all measurement devices, they have their weaknesses. It is a fairly common sight on our roadways: a law enforcement officer standing by their patrol car aiming a radar gun at oncoming traffic.
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