How fast can you go on the highway without getting the attention of police? Anything under 10 miles per hour over the speed limit is okay, right?Well, the North Carolina Department of Transportation is ready to burst the bubble on the widely believed 9 mph cushion myth.The governor's highway safety program is ramping up what's being called "Obey the Sign or Pay the Fine" speeding enforcement crackdown.Apparently, there's a belief out there that if the speed limit is 65, officers or troopers won't pull you over if you're doing 1 to 9 miles per hour over the limit - a so called buffer zone.The DOT says that's not the case.Law enforcement says beginning Thursday, they'll target and ticket anyone driving above the posted speed limit.