Although this radar is effective in controlling speeds of the objects on which the measurement is made, they are not error-free. For an accurate measurement, the object whose speed is to be evaluated should be the only moving object in the radar beam. If this is not the case, more articulation is needed to test the speed of a particular vehicle.

In the US, the National Highway Traffic Safety Administration (NHTSA), in cooperation with the International Association of Chiefs of Police (IACP), develops training programs for operating radar guns. Its curriculum provides radar gun operators with the skills required for proper use, testing, and target identification. Provides operators with information on local and state laws and ordinances applied in the jurisdiction.

Control personnel can be trained in the practice of visual speed and distance estimation, using radar as a verification of human estimation.

It should be noted that the angle at which the object is in relation to the radar can affect the reading: a phenomenon known as the "cosine effect". In addition, there is interference in the RADAR bands from cell phones, other types of transmitters, electrified lines, signals and even stationary walls can create erroneous readings.

Radar works by emitting invisible electromagnetic waves at certain frequencies. In comparison, shining a beam of light from a flash onto an object, the light is reflected by objects, allowing a person to see the object in the dark. The same principle applies to the radar beam. Radar emits radio frequency waves, and will be reflected off most metal objects, concrete, trees, wood, etc.

The radar unit uses an antenna to "read" radio signals reflected from the object (such as a vehicle). If the radar beam hits a moving target, the frequencies of the waves would change based on the principle of "Doppler drift." With those frequencies reflected and changed, and knowing the frequencies that the radar emits, your computer will calculate the speed of the mobile. Note that the radar cannot determine the speed of the target if the target passes perpendicular to the radar beam, and thus there will be no Doppler drift in the radar antenna.

Many interferences occur towards the radar antenna, since it accepts all available microwaves to "listen". For example, high voltage lines, telephone lines, power plants, even neon lights emit electromagnetic waves. Any specific source of waves cannot be identified. Additionally, radar cannot determine which target each wave reflects. If there are two vehicles traveling in close proximity, each car will be responsible for the resulting radar reading. Identifying the target is a difficulty for the radar operator, and frequently produces errors. At 200 m, the width of the radar beam can usually cover all 4 lanes of traffic in both directions, causing a large error in determining which target is responsible for the radar reading. Even if there is only one vehicle on the road, radar has a typical range of approximately 400 m, which is the visual range of most human eyes. While the radar can read a vehicle at 300m, the officer can only read a vehicle towards him at a distance of 150m.

Furthermore, the radar does not necessarily acquire the highest speed object, since the strongest return signal can be affected by different factors, such as the size of the rover, the cross-sectional area facing the radar antenna, its relative speed and the distance to the radar. For example, if a Corvette is moving at 80 km/h 50 m from the radar, and a truck is moving at 110 km/h but 2 km away, the radar can acquire the truck's return signal and record a speed of 110 km/h. The operator will believe that this violating value corresponds to the Corvette and will prepare an incorrect violation ticket. Another example is when the radar gun is used near an international airport, where the radar can acquire signals from aerial objects. In this case, extremely anomalous recorded speeds appear because they are so fast: 300-400 km/h. And if a commercial aircraft flies a few km away from the radar gun, it can acquire the return signal from that ship, which is immensely large compared to any land vehicle.

There are radars that can identify multiple targets, determining their individual speeds, range, size, altitude, direction of travel, etc., but those radars cost hundreds of thousands of dollars. The important thing about a radar gun is its low price, its maneuverability, and its absence of errors.

There is a variant of the radar gun, called motion radar. It works in essentially the same way as those already described above, with the exception that this type of radar is used with the control vehicle in motion (such as in highway control, for example). The unit has two readers, one shows the speed of the target, and the other the speed of the control vehicle. Sometimes there are very strong return signals, usually reflected from highway signs, bridges and other large objects, and are assumed to control speed. The next strongest signal is assumed to be that of the target. Since the speed of the target depends on the speed of the control, this motion radar is subject to all the errors of the stationary radar, plus the errors of determining the speed of the control vehicle.

Another type of traffic radar is photo radar. Strictly speaking, this photo radar is not a variation of the traditional radar. It is basically a stationary radar with the ability to take photos. This type of radar is never used in motion mode. The operator usually positions the photo radar on the side of the highway, pointing the radar toward oncoming traffic. Sometimes the radar is not held in your hand, but inside a vehicle such as a minivan. The camera is mounted on top of the vehicle and is connected to the radar, and takes readings without operator intervention. Thus, the radar monitors traffic speeds continuously, and if a speed violation is detected, the camera automatically takes an image of the license plate of the vehicle in violation. At the end of the day, all photos are displayed, a violation ticket is made and mailed to the respective registered owners of the vehicles.

Radar is not infallible as many people believe. Although technology has come a long way in recent years, and radar units are becoming friendlier and friendlier, radar continues to fail, especially in the hands of poorly trained operators.

In New South Wales, Australia, the radar gun is used using expert evidence and GPS.[2]​.

Although this radar is effective in controlling speeds of the objects on which the measurement is made, they are not error-free. For an accurate measurement, the object whose speed is to be evaluated should be the only moving object in the radar beam. If this is not the case, more articulation is needed to test the speed of a particular vehicle.

In the US, the National Highway Traffic Safety Administration (NHTSA), in cooperation with the International Association of Chiefs of Police (IACP), develops training programs for operating radar guns. Its curriculum provides radar gun operators with the skills required for proper use, testing, and target identification. Provides operators with information on local and state laws and ordinances applied in the jurisdiction.

Control personnel can be trained in the practice of visual speed and distance estimation, using radar as a verification of human estimation.

It should be noted that the angle at which the object is in relation to the radar can affect the reading: a phenomenon known as the "cosine effect". In addition, there is interference in the RADAR bands from cell phones, other types of transmitters, electrified lines, signals and even stationary walls can create erroneous readings.

Radar works by emitting invisible electromagnetic waves at certain frequencies. In comparison, shining a beam of light from a flash onto an object, the light is reflected by objects, allowing a person to see the object in the dark. The same principle applies to the radar beam. Radar emits radio frequency waves, and will be reflected off most metal objects, concrete, trees, wood, etc.

The radar unit uses an antenna to "read" radio signals reflected from the object (such as a vehicle). If the radar beam hits a moving target, the frequencies of the waves would change based on the principle of "Doppler drift." With those frequencies reflected and changed, and knowing the frequencies that the radar emits, your computer will calculate the speed of the mobile. Note that the radar cannot determine the speed of the target if the target passes perpendicular to the radar beam, and thus there will be no Doppler drift in the radar antenna.

Many interferences occur towards the radar antenna, since it accepts all available microwaves to "listen". For example, high voltage lines, telephone lines, power plants, even neon lights emit electromagnetic waves. Any specific source of waves cannot be identified. Additionally, radar cannot determine which target each wave reflects. If there are two vehicles traveling in close proximity, each car will be responsible for the resulting radar reading. Identifying the target is a difficulty for the radar operator, and frequently produces errors. At 200 m, the width of the radar beam can usually cover all 4 lanes of traffic in both directions, causing a large error in determining which target is responsible for the radar reading. Even if there is only one vehicle on the road, radar has a typical range of approximately 400 m, which is the visual range of most human eyes. While the radar can read a vehicle at 300m, the officer can only read a vehicle towards him at a distance of 150m.

Furthermore, the radar does not necessarily acquire the highest speed object, since the strongest return signal can be affected by different factors, such as the size of the rover, the cross-sectional area facing the radar antenna, its relative speed and the distance to the radar. For example, if a Corvette is moving at 80 km/h 50 m from the radar, and a truck is moving at 110 km/h but 2 km away, the radar can acquire the truck's return signal and record a speed of 110 km/h. The operator will believe that this violating value corresponds to the Corvette and will prepare an incorrect violation ticket. Another example is when the radar gun is used near an international airport, where the radar can acquire signals from aerial objects. In this case, extremely anomalous recorded speeds appear because they are so fast: 300-400 km/h. And if a commercial aircraft flies a few km away from the radar gun, it can acquire the return signal from that ship, which is immensely large compared to any land vehicle.

There are radars that can identify multiple targets, determining their individual speeds, range, size, altitude, direction of travel, etc., but those radars cost hundreds of thousands of dollars. The important thing about a radar gun is its low price, its maneuverability, and its absence of errors.

There is a variant of the radar gun, called motion radar. It works in essentially the same way as those already described above, with the exception that this type of radar is used with the control vehicle in motion (such as in highway control, for example). The unit has two readers, one shows the speed of the target, and the other the speed of the control vehicle. Sometimes there are very strong return signals, usually reflected from highway signs, bridges and other large objects, and are assumed to control speed. The next strongest signal is assumed to be that of the target. Since the speed of the target depends on the speed of the control, this motion radar is subject to all the errors of the stationary radar, plus the errors of determining the speed of the control vehicle.

Another type of traffic radar is photo radar. Strictly speaking, this photo radar is not a variation of the traditional radar. It is basically a stationary radar with the ability to take photos. This type of radar is never used in motion mode. The operator usually positions the photo radar on the side of the highway, pointing the radar toward oncoming traffic. Sometimes the radar is not held in your hand, but inside a vehicle such as a minivan. The camera is mounted on top of the vehicle and is connected to the radar, and takes readings without operator intervention. Thus, the radar monitors traffic speeds continuously, and if a speed violation is detected, the camera automatically takes an image of the license plate of the vehicle in violation. At the end of the day, all photos are displayed, a violation ticket is made and mailed to the respective registered owners of the vehicles.

Radar is not infallible as many people believe. Although technology has come a long way in recent years, and radar units are becoming friendlier and friendlier, radar continues to fail, especially in the hands of poorly trained operators.

In New South Wales, Australia, the radar gun is used using expert evidence and GPS.[2]​.