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A radar detector is an electronic device used by motorists to determine if their speed is being monitored. The term originates from early speed-detection technologies, in which police bounced a radio wave off of a moving vehicle with a device that determined the vechile's speed by the Doppler-effect-moderated change in the wave's frequency. Later speed-detection technology uses pulsed laser light rather than radio waves; modern "radar detectors" have been adapated to suit that technology.
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