My understanding is that a radar should be able to zero it self while moving which would allow the cop to pick up your speed if traveling in the same direction.
Now the same idea can be figured for two cars traveling in an opposite direction, even after they pass each other, once the beam returns it will use a doppler calculation to determine your speed. I mean, all radar is technically inaccurate since it is based on a beam traveling over a distance and returning and then calculating the variables. More variables the great the risk of inaccuracy.
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