I grew up 25 miles south of Alt. WV 2 and remember as a kid, why it was there.
Back in 1970, when I was 4-years old, my parents frequently took me from our home just outside of Paden City to Moundsville so that I could visit a podiatrist by the name of Dr. Pritt to help fix my feet (didn't have arches). I remember that Dad had to take Alt. 2 in order to get to Moundsville. WVDOH was in the process of "twinning" WV 2 and was cutting back the hillside to complete the 4-lanes between the ends of Alt. 2. So all traffic was rerouted onto Alt. 2 until the Rt. 2 section of the 4-lane was completed.
As you approached the northern end of Alt. 2 in Moundsville, you had to go thru two switchback turns to descend from the hilltop back into the valley. I remember being petrified as cement trucks and tractor-trailers headed the other way (southbound) passed by as we all went thru these two switchbacks.
At that time, there was only a Moundsville ferry (no Moundsville bridge) and no I-470 or I-470 bridge. To use Ohio as a detour around this, you had to cross on I-70 on the Fort Henry Bridge at one end, then cross at the New Martinsville Bridge at the other end. You could also use the Bellaire Bridge, but even back then it wasn't "heavy truck" friendly.