Ten Miles Above the Speed Limit

Where I live the police by law give drivers a ten mile cushion above the speed limit before they write a ticket. The only two exceptions are state police and speeding in a school zone.

What do we do when we’re armed with knowledge like this? Drive the speed limit? Drive ten miles over knowing that we almost certainly won’t get a ticket? Or drive more than ten miles over and take our chances? What motivates us to take risk, and how much?