Bad misconception..... Radar guns are a estimate and your theory is true on the 3-5 MPH range. However most state angencies are switching to "Lidar" which is near deadly accurate, and can be operated from inside the cruiser....with the window fully up (incase you ever see a trooper just "sitting" there) and the 3-5 MPH window for a estimate is not there anymore.
I know CA Highway patrol use them, don't know if they only use that device or not.
*edit*
Ya, your NOT supposed to flash your highbeams at traffic..........so no 2 flash non-sense.
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