What is necessary for a RADAR unit to function accurately?

For a RADAR unit to function accurately, a clear line of sight to the target vehicle is essential. This ensures that the radar waves emitted from the unit can directly reach the target without any obstacles that might interfere with their propagation. When there are no obstructions, the RADAR can properly measure the speed of the vehicle returning the reflected signals more accurately.

In contrast, while the vehicle's speed being constant may seem plausible, RADAR can measure speed regardless of whether the vehicle is accelerating or decelerating. Additionally, although good visibility weather conditions are helpful, they are not strictly necessary for the RADAR to perform its fundamental function. Lastly, while calibration is important for maintaining accuracy over time, calibrating the RADAR hourly is not a universal requirement. Regular calibration is essential, but the specific intervals can vary depending on agency protocols and operational conditions.