The scarriest road we have ridden (and I had to U-turn before the top) was the Mount Washington Road in New Hampshire.

Curious about what caused you to "U-turn" on Mount Washington? We have a family reunion at Winnepasaukee every summer and I finally had one of my Valks up there last summer with the intent of "planning an assault" on that beautiful mountain. Unfortunately the week I was there during July last year, it rained EVERY SINGLE DAY (even had some tornados which is rare for that part of the country). It seems that you are fairly well traveled, so I am curious as to what spooked you on the way up that mountain!
P.S. - On a personal note, I did have a scary experience on Mount Washington when I took the "Cog Railway" trip up the mountain!
Jim