Radar And LIDAR are two different devices. LIDAR is hand held and target specific. You look thru the lens at the target vehicle and the device shows the speed in the viewfinder. Pull the trigger and it freeze captures the vehicle picture and the frozen speed which can be shown to the violator.
Radar is not target specific and requires the operator to,identify the fastest moving target. The radar will record the speed in either direction, stationary or moving, all the Officer has to do is correctly choose the speeding vehicle.
Ah yes, reminds me of the “Double Nickel” days.
When cops would pull over multiple vehicles at one time, and tell each driver they had been nailed by Radar.
It does not work that way, but the revenue was huge and of course it’s OK to lie to “Criminals”!
I also remember when Cincinnati Microwave got ahold of some radar guns, and found a TREE was clocked at something like 65 MPH!