I know someone mentioned this before, but do yourself (and your family) a favor by taking the detour at Corbin, KY, because of the rock slide on the southbound lane. We took it last week and it was a breeze with some very nice scenery thrown in. On our way home (northbound) we saw the 12 MILE backup (that looked like a parking lot) on the southbound side. Once those semis are stopped it takes a loooonnnnnggg time for them to get up those inclines. We were so thankful we did the detour.