i have a really good idea. its called don't speed so much
but seriously, were you just not paying attention?
anyways, well you could. chances are there could be a mistake in how the ticket was writen up, so it never hurts to check that out. also make sure teh date is corrent (yes i have seen them do that too) if it is wrong and you can prove you were somewhere else at teh time then you get off scott free. same can be true if they wrote it up for the wrong thing.
just some thoughts