Which factor can greatly reduce the reliability of speed detection from radar units?

The reliability of speed detection from radar units can be significantly impacted by heavy vehicular traffic. When there is a high volume of vehicles, the radar unit may struggle to accurately measure the speed of a specific target due to reflections and interference caused by multiple vehicles in close proximity. This phenomenon, known as “multiple target tracking,” can lead to erroneous speed readings or difficulty in identifying the intended target vehicle among numerous others.

In contrast, while weather conditions, radar technology type, and location of the radar unit also play roles in influencing the effectiveness of speed detection, heavy traffic presents a unique challenge by introducing variables that can directly confuse the radar system’s ability to isolate and track individual vehicles effectively.