@Meno
Nowhere in my post did I say it is legal to drive above the posted speed limit. Please don’t put words in my mouth and then state I said something was legal.
Many states have a ‘fair and reasonable’ doctrine that can be used in defense of a traffic ticket. For example:
‘Your honor, there day was sunny and clear. There was little traffic, tghe car ahead of me in the right hand lane was only going 55 in a 65MPH posted zone. I accelerated in the left lane to 68 MPH to overtake the slow car, returned to the right hand lane and resumed a speed of 64MPH.’
Police radar guns clock a diriver at an instant in time, there is no recording of how long you exceeded the speed limit to decide whether or not to issue a citation.