Which of the following is a common limitation of radar speed measurement?

The choice indicating the inability to measure multiple vehicles simultaneously is accurate because radar speed measurement systems are typically designed to capture the speed of a single target vehicle at a time. This limitation arises from the way radar works; it emits electromagnetic waves that bounce off objects and return to the device, allowing it to calculate speed based on the Doppler effect. When multiple vehicles are present, the radar may struggle to differentiate between their signals, leading to potential inaccuracies or a total failure to obtain any readings.

Understanding this limitation is crucial for proper usage and interpretation of radar data. It highlights the need for law enforcement officers to ensure that they are targeting a single vehicle rather than attempting to assess the speeds of multiple vehicles at once, which could lead to legal complications or erroneous traffic enforcement actions. This fundamental characteristic of radar technology emphasizes the importance of selecting the right monitoring techniques depending on the traffic conditions and the number of vehicles in the area.