I only go 5 over, though a few weeks ago I was in a convoy heading to New Orleans on a mission trip. The truck I was in (pulling a trailer) was trying to get the driver in fronts attention we needed to stop for some reason. Instead of cell phone, flashed the lights. Driver in front thought we wanted to race and floored it. We tried to get in front, we entered a work zone and the truck had gotten up to 83......and wouldn't you know it, the bright blue lights came on. He was nice and didn't enforce a few things and gave the driver a normal ticket. Amazingly, Illinois speeding tickets are cheaper then New Orleans tickets (once again, I wasn't driving, but in another one of the vehicles and they got us right were it went from 70 to 60 and we were being passed by everyone).