If you DO get a ticket for 1 or 2 miles over, fight it. It will clog up the already clogged-up courts so fast, that they'll have to stop writing idiotic tickets. I know this (at least in Minnesota) because an attorney friend of mine was in a courtroom awaiting his client's case, and the case before his was some guy there to fight a ticket written for something like 58 in a 55. The judge scolded the law enforcement person that wrote the ticket, threw out the citation, and told the LEO to quit bringing in petty shit and clogging up the system.
On a side note, if speed enforcement is really about safety, and not revenue generation, (I'm not talking about reckless, dangerous driving) then shouldn't law enforcement vehicles be painted safety yellow or orange, and make themselves conspicuous to the public to remind us to slow down? Not hiding behind a sign or bush in an unmarked, nondescript, bland-colored vehicle. Just a thought.