Did a bunch on the Blueridge Parkway last October. Met with an old racing buddy at cabins (Rocky Knob Cabins which I guess is one of the few places to actually stay on the Blueridge) on the Parkway down a bit north of the Meadows of Dan (actually the Rocky Knob/Mabry Mill area). Not much traffic...but that may have been due to visibility of about 50 feet max due to fog and rain. But we rode. Not much more fun that descending at 50-60mph in the fog and have to take your Oakleys off due to the dampness and not being able to see.
My take was in that area the motorists were very careful of us and paid attention.
On a nice day it might have been different.
We were there to go to Martinsville for the NASCAR race...this was the weekend that the Hendrick Motorsports plane crashed in heavy fog.