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Throughout history, law enforcement officials have utilized a wide array of speed measurement devices which have varied greatly in their ease of use and accuracy. As of now, police departments use four primary devices to measure speed:. Aircrafts and photo radar are sometimes used as well, but to a lesser extent. There are pros and cons to each method. Speedometer clocks are the least technologically advanced method of measuring speed and have been largely replaced by more efficient devices. However, they are still used in some places because they are the least expensive method of clocking speeders and report fairly accurately. When a wave is reflected, its frequency changes, and the radar interprets the discrepancy in a speed calculation. This change in frequency is commonly known as the Doppler Effect or Doppler Shift. Radar is the most popular method for enforcing speed limits. Because of this, many consumers choose to purchase radar detectors, which are able to determine when a speed-detecting radar is nearby. An average speed computer is a technological device that uses a computer program to measure speed. It does this by dividing the distance traveled by the time it took to travel that distance, which provides the average driving speed over the course of that distance. These devices are often found in police patrol cars. Because they do not use electro-magnetic waves, they cannot be detected by radar detectors. LIDAR, or laser, devices use an infrared light wave emitted at frequencies that allow the beam to be focused into a narrow target area. These are usually hand-held devices used outside of the patrol car because the glass of the windshield can reduce the range of the device. While it is possible to detect the laser beams emitted by LIDAR, the devices that do so are limited in their effectiveness, which makes this device the first choice of many law enforcers. Aircraft are sometimes used as speed measurement tools. In this case, speed enforcement is achieved through a combination of ground-based units and a fixed-wing plane. To use this method, lines must be painted on the pavement to identify a course. As vehicles travel on the designated course, a clock is activated on the airplane. After the course is completed, the speed is calculated, and if the vehicle was driving over the speed limit, the ground units are notified. A photo radar device is like a typical radar device except that it takes a photograph of the vehicle and license plate of the speed offender. The date, time, and speed can then be added to the photo file. As of now, police departments use four primary devices to measure speed: The goal of our DUI Foundation portal is to break down that barrier of drinking and driving ignorance. Each state enforces varying levels of law, policy, and legislation. Our website aims to provide state specific facts across our entire knowledge center for you.

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