I was pulled over many years ago from supposedly rolling through a stop sign.. The cop said I blew threw it and I told I know for a fact that I came to a complete stop.. He said how do you know that, I went back to my bike and showed him my cyclocomputer that show MPH in 10ths of MPH.. I told him nicely of course that it registered 0 mph and I looked both ways. He let me go.. Remember there are a lot of police officers who see bike riders as a nuisance. Be polite and you might get off.. If you act like a jerk your getting the ticket for sure..