Which factor can affect the accuracy of radar readings?

The angle of the radar beam relative to the target vehicle is crucial in determining the accuracy of radar readings because it directly influences how effectively the radar can detect and measure the speed of a moving object. When the radar beam hits a vehicle at an optimal angle—typically perpendicular to the direction of movement—the readings are more accurate. However, if the angle is too acute or obtuse, the speed measurements can become skewed due to the cosine effect, where the radar returns a lower or higher speed than the actual. This is vital for law enforcement and traffic management, as precise speed readings are necessary for enforcing speed limits and confirming the behavior of vehicles.

While weather conditions, the type of radar used, and distance from the radar source all play roles in radar readings, they do not have the same level of impact on the angle of the radar beam for accuracy. For example, weather may obscure visibility but doesn't alter the fundamental relationship between the radar and the target, and radar types or distance can affect performance but do not fundamentally change the measurement process as angle does.