I use my cruise control to stay at the speed limit because if you go over the speed limit you get a ticket and if you go slower than the speed limit the guy behind you will climb right over you all the while screaming and waving his finger. Occasionally when someone is so close I can count the hairs in their nostrils in the rear view mirror, I'll just hit the brake enough to scare them. sometimes I'm smarter than that and pull over and let them pass.