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A radar detector is a device that detects police radar radio waves and then alerts you to the presence of the police radar. Most of the radar detectors available today also have the ability to detect laser (lidar) speed detection devices. A laser is a device that sends out beams of light instead of radio waves, and reflects off the speeding vehicle before returning to the laser unit. The speed is calculated by measuring how quickly these pulses of light are reflected. The best radar detectors have the ability to detect all frequencies of police radar as well as laser.

You should be aware that radar detectors are illegal in passenger vehicles in Virginia and Washington, DC. In addition, radar detectors are illegal on U.S. military bases, and federal law bans the use of radar detectors in commercial vehicles over 10,000 pounds.

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