They should play music from the current year's artists at the toll booths.
I like this idea. I also loved the Bonnaroo radio station you could listen to as you got near Manchester. While it played great music, I'd have prefered if it played music of artists playing the festival that weekend.
Then again, I listened to cd's the entire 10 hour drive up of bands performing the festival, in the order I was going to see them so I guess I already had that covered.