As per non-moving objects in the way, I would guess if the radar gun picked up a speed then they were obviously not in the way.
With a single car that much in front of the pack I would assume he could get a clear reading, But if you were side by side with another car, I saw a guy beat that in court as he said he was being passed by the other car and how did the cop know which car he actually radared and he won.
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