This posting is coming to you from Weston, western end of Corridor H, where I spent the night last night.
I drove part of the Corridor H route yesterday on my way back from New York. I took VA 55/US 48 from I-81 west to Wardensville. Around 20 miles, took about 25 minutes, not a bad road at all. (Randy Hersh's head will explode at that news and when he sees the video I shot).
You have to drive through Wardensville and then there's access to the new four-lane, which is a fast and scenic drive over to Moorefield. All traffic is forced off the four-lane at what I call a West Virginia diamond (examples are US 119 at WV 73 in Logan and I-64 at former US 35/current WV 817 west of Charleston) and onto a connector route that leads down to US 220, although the completed bridge over the South Branch of the Potomac can be seen in the distance. From there I deviated from the route Corridor H is supposed to follow and took WV 55/WV 28 south to Seneca Rocks. This is a very good road, mostly flat and straight, although it could use resurfacing in several places), and the worst part of the trip is US 33, where you cross three mountains before you get to the "racetrack" four-lane section east of Elkins. Traffic alway moves slowly through Elkins, that town needs a downtown bypass, but I followed US 33 out to Corridor H and over to Weston, where I decided to stop for the night.
I'll have to check my mileage on my odometer, as I filled up in Strasburg and reset it, but the mileage should be around 175 between I-81 and I-79. Time was a little less than three hours. Traffic was light on the two-lanes and there were no slow trucks to have to follow across the US 33 mountain crossings. Even as is, it's a pleasant and scenic alternative to going all the way north to I-68. When completed it will be a much more direct route from Charleston, Huntington, Lexington, Louisville, Cincinnati, and even Evansville and St. Louis to the DC area than any combination of I-70 or I-68 through Maryland and Pennsylvania.