i've looked at a map and it appears that Hughes Gap Rd will take one to the vicinity of Roan Mtn and Carvers Gap. Anybody with detailed info about this. I'll be there this weekend.
Yes, it will take you to within a couple miles of the start of the Roan climb, which is 7 miles itself, and culminates at Carver's Gap which is the top. But, I have not ridden on Hughes and don't know if its paved. On the Roan event itself, you turn on 143 from 19E and don't ride Hughes Gap.
Roan is a great climb, and I highly recommend the event at the end of this month. The entire route is nice, almost storybook in some respects. The Roan descent back into Bakersville is about as nice a decent as you will find in these parts.