本标准的范围仅限于执法机构用于执行车速规定的雷达测速装置，这些雷达装置在a？在路上吗？（DTR）时尚，意味着雷达瞄准的方向名义上与道路上的行驶方向平行，并朝向交通方向。这些DTR雷达单元发射调制或未调制的连续波（CW）微波能量，接收微波束内移动车辆反射的信号，处理反射信号的多普勒频移，以测量和显示被跟踪车辆的速度，以及巡逻车辆的速度（如果适用）。 本标准不适用于无人雷达测速装置、自动测速装置或DTR雷达距离测量。

The scope of this standard is limited to radar speed-measuring devices used by law enforcement agencies for enforcing vehicle speed regulations, where these radar devices are operated in a "down-the-road" (DTR) fashion, meaning that the radar is aimed in a direction nominally parallel to direction of travel on the roadway and toward traffic. These DTR radar units transmit modulated or unmodulated continuous-wave (CW) microwave energy, receive the signal reflected from moving vehicles within the microwave beam, process the Doppler shift of the reflected signal to measure and display the speed of the vehicle that is being tracked, and if applicable, the speed of the patrol vehicle. This standard does not apply to unmanned radar speed-measuring devices, automated speed enforcement, or DTR radar range measurements.