What does "beam width" refer to in RADAR detection?

Beam width in RADAR detection is critical because it refers to the width of the RADAR signal emitted from the device. This width significantly influences the device's ability to detect multiple vehicles simultaneously. A narrower beam width allows the RADAR system to focus more precisely, leading to better resolution and the ability to distinguish between closely spaced vehicles. In contrast, a wider beam width may capture more vehicles within the detection range but could reduce the accuracy in identifying them, as overlapping signals can cause difficulty in determining which specific vehicle is being measured.

The other options pertain to different aspects of RADAR technology. The distance the vehicle is from the unit is related to range measurement rather than beam properties. The height of the RADAR unit during operation would impact installation and placement but does not define the beam width itself. Lastly, the frequency range of the RADAR signal relates to how radar waves propagate and interact with objects, which is separate from the beam width concept. Understanding beam width helps operators optimize detection capabilities in various traffic scenarios.