In almost all states, unless you are a commercial driver, radar detectors are legal devices that you can have in your vehicle. However, it is always prudent to double check as laws may change. The battle with radar detectors is like an arms race, the best models are the most effective. Your primary consideration is deciding if the radar detector will be for multiple cars. If so, you will need a portable model.
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If not, a dash-installed unit is usually the better option. You'll want a sensitive detector with an adjustable antenna that can discriminate against false alarms and is WiFi- or Bluetooth-enabled. If you'd like to read more on how a radar detector works and learn where optimum placement in your vehicle is, continue reading. If you're ready to move ahead and get your radar detector, consider one of the options that we've highlighted.
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. Depending on the sophistication of the device, a radar detector can alert a driver via a panel that signals the presence of police radar as well as the posted speed limit and the car’s current speed. Newer, high-end radar detectors can also send out a jamming signals that block the radar from tracking a car equipped with such a device.
The radio waves present in any one area – TV and radio signals, signals, and so on – can create many false alarms, but some newer radar detectors can differentiate between various kinds of electromagnetic waves to limit the number of errors. 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.
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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.
Aside from sensitivity, one of the most important factors to consider when selecting a radar detector is the number of false alarms it sets off. With so many radio waves in the atmosphere, lower-end radar detectors can be set off by any number of devices, including automatic door openers (the kind you would find at the entrance of a supermarket) and other radar detectors. To avoid false alarms, higher-end radar detectors have built-in filters used to tune out frequencies common to the radio waves that generate false alarms.
At the time of this writing, radar detectors were legal for passenger vehicles in 49 of the 50 states, with Virginia and the District of Columbia being the exception, and all 50 states forbid the use of radar detectors in commercial vehicles. Also at the time of this writing, radar detectors are legal only in the Canadian provinces of Alberta, British Columbia, and Saskatchewan.