Are Speed Radar Guns Inaccurate? These Technologies Beg to Differ

Car passing speed limit sign

Car passing speed limit sign

Speed remains as one of the primary factors that cause road accidents. As such, there are policies in place to ensure that drivers will keep themselves in a specified speed limit to reduce accidents.

Among these is the use of radar speed guns by law enforcement officers to assess the speed of each car passing by. Though radar speed guns have been around for ages, not all states are using them. This is because drivers have come up with devices that disrupt the transmissions on speed radar guns. Moreover, many lawyers are now disputing the reading of a speed radar gun when used as a primary form of evidence against a speeding driver.

Most states have been fooled into thinking that radar speed guns are no longer valid for the accurate speed measurements of drivers on the road. Manufacturers, however, have come up with various technologies that boost the accuracy of speed guns and make them less prone to interference by any device. The following are some of these technologies:

Digital Radar

The only option for speed guns in the past was an analog radar gun. Nowadays, there are digital radar guns that measure speed on 1-inch travel distances of targeted vehicles compared to the 10-15 car lengths used in analog guns.

This means that the speed readings on digital radar guns are immediate and you can record car speeds for up to two miles from your location. As such, you have an increased speed tracking range of a vehicle and more convincing evidence that a driver was over speeding.


In the past, there were two primary frequencies for speed guns — the K 24.150 GHz and the X 10.525 GHz bands. Nowadays, there is the Ka-band. This has a smaller beam divergence compared to the X and Ka bands, meaning you will have fewer vehicles within a beam and the reading will be highly precise. Furthermore, you can change frequencies with the Ka-band, making it hard for radar detectors to pick the speed gun’s signal and distort it.

Fast Vehicle Mode

Analog radar guns will show the strongest reflected signal in its range. This is frustrating if you are targeting a small speeding car in a fleet since the gun will pick the reading of the largest truck. A fast vehicle mode technology, however, displays the speed of the fastest car in an approaching group of vehicles in addition to the most reflective one.

Direction Sensing Radar

Police officer aiming radar gun

Older speed guns are two-directional in their reporting and will show speeds of approaching and departing vehicles. This loses the accuracy of a speed reading since an officer cannot confirm a target vehicle’s identity. Direction-sensing radar guns, however, only record speeds in a single direction picked by an officer hence eliminating the confusion caused in bi-directional guns.

With the above technologies, the inaccuracy and interference of your state’s speed guns will be a thing of the past. They will be your best bet to getting speeding drivers convicted. Though a bit costly compared to the speed guns used in the past, the cost is worth the accidents you will prevent on your roads.