I'm not sure what the interstates are like in the states you guys live in, but just to make sure we're all thinking of the same thing...here in Illinois, we have the Northbound lane (or eastbound as the case may be) and the southbound lane (or westbound as the case may be) and periodically, you'll come across a paved drive between the two lanes which provides quick access from one lane to the other. There are signs which say no U-Turn; authorized vehicles only. We were on our way home one day and there was a big traffic backup, so I thought I would take the u-turn thingy and get back into the westbound lane and catch a highway up a mile or two back and take a different way back home, bypassing the backup. I checked for cops, of course and, seeing none, I proceeded to do the U-Turn. In my mirror, I saw a white car coming up on me and then I saw the equipment in the car and I knew it was a cop that I had apparently failed to see. She pulled me over and gave me a warning. Had she given me a ticket, I would not have cried foul and would have totally understood, because I knew I wasn't supposed to do that (although I won't say that I would never do it again if I felt like I needed to, LOL). I appreciated only getting a warning, of course, but I knew I was responsible for it and would have felt no injustice in getting a ticket had it come to that.
So contrary to what some of you may think, I do believe in personal responsibility and I do believe in ticketing speeders. I just don't hold to such a black and white view which leaves no room for mitigating circumstances and no room for a margin of error (such as taking into account possible discrepancies in speedomoters, for example).