Driving Roads / Blue Ridge Parkway

At 469 miles it is the longest linear park in the U.S., running the crest of the Appalachians with endless overlooks and a relaxed 45 mph pace. It runs about 469 miles along Blue Ridge Parkway in North Carolina / Virginia. Drive time: 2-3 days end to end.
Best time to go: Spring through fall; peak color late September on the summits into late October in the valleys. Many sections are not maintained in winter, and some stretches close for storm damage, so check the NPS road status page before you go.

Sources: Length · High point · Best time.
A long-haul cruise road: record each day and your drive log keeps the distance and time of every leg, filling in the parkway on your map one stretch at a time.
The speed limit is 45 mph (lower in many spots); slow for fog, wildlife and cyclists, and pull into overlooks to enjoy the view safely.
Open Road keeps every drive: the route on a map, the time and the distance. On iPhone and Android.