North Carolina RADAR State Practice Exam

What are the two speeds measured by a moving RADAR instrument?

1. Speed of the patrol vehicle and target vehicle speed

2. Speed of the target vehicle relative to ground and patrol vehicle speed

3. Speed of the patrol vehicle and traffic signal speed

4. Target vehicle speed and city limit speed

The correct answer is: Speed of the patrol vehicle and target vehicle speed

The correct answer highlights that a moving RADAR instrument measures both the speed of the patrol vehicle and the speed of the target vehicle. This dual measurement is critical for understanding how the RADAR system calculates the relative speed between the two vehicles. When the patrol vehicle is in motion, the RADAR can determine the speed of the target vehicle by taking into account the speed at which the patrol vehicle is traveling. In a situation where the patrol vehicle is moving, it’s important to capture the dynamics of both vehicles to accurately assess whether the target vehicle is exceeding the speed limit or not. The technology works by emitting radar waves that bounce off the target vehicle and return to the RADAR device. By analyzing the change in frequency of these reflected waves, the system can determine the speed of the target vehicle in relation to the speed of the patrol vehicle. This ability to measure both speeds allows law enforcement to accurately document speeding violations and is essential for fair and just enforcement of traffic laws. The other options do not correctly represent the fundamental mechanics of how a moving RADAR system functions, leading to an incomplete understanding of its operation.