I echo what others have said. Blue Ridge Pkwy is beautiful, winding, and slow in spots. You also have to be on the lookout for Grandma and Gramps in a silver Buick, doing 25 mph...
You mentioned fog. Whoa, my wife Margaret and I went on the Blue Ridge one morning and, honestly, we couldn't see 10 feet in front of the car! [&:] Wait until some of the fog burns off and it'll be a little safer drive....
Butch A.