They also do a trick with unmarked cars and trucks. You pass one guy on double yellow, he will radio ahead and they block the road and give you a ticket. The other thing to watch out for is at the end on the Tennessee side. Usually have at least one sometimes two patrol cars on the straightaway beside the river at the end of the runout. It's a nice long straight section of several miles and the temptation is to haul ass through there. Watch it, almost always patrolled there by the river.
Lastly, much better if you can get there during the week. Lot less law enforcement then, and you won't have to play it so close to the vest. On weekends, it's hard to run it fast anyway, because of the traffic. Lots of people up there on weekends, sports cars too.