Probably parked along the shoulder or tossing crap out the window. If you eat at the rest stops, the biggest violation is excessive flatulence. Will lift the car right off the road.
The thing you'll hear the most on NJSP is a trooper clearing '20 bravo-charlie'. That means the person did something pretty stupid, and the trooper cut him/her a break (warning for a moving violation, ticket for a non-moving violation).