...stopped on the shoulder in the middle of a speed trap once (as i saw them "hiding).....counted to 20 just in front the last officer, put on my indicator and drove back on the h/way and left them. When the "flagman" stopped me, i asked how fast was i going seeing that they could have never gotten a correct speed...
last spped trap when flagged down by the second( white PVC length) officer, I told him I didn't feel I could safely reverse to the first set of officers safely, so they let me be.