I used to deliver pizza for a major pizza chain and one night I got pulled over for doing almost 70 (according to the cop) in a 50mph zone. It was a lonely street with no houses or anything. I explained to the officer that I had just purchased new tires that were one size bigger than they were supposed to be so my speedometer was off. He said it wouldn't be off by that much. Then the cop saw that I was delivering pizza and let me go with a warning.