US 191 in Eastern Arizona between Clifton & Alpine

Yes. We mistakenly took the road from the north from Alpine to Clifton with our 40' motorhome. Luckily it was in October without the summer traffic. I will say it was a beautiful drive downhill with the fall colors. It has VERY tight turns though. The first sign we came to that stated something like 'no vehicles over 40'' was in a place where there was no turnaround. In fact, there were no turnarounds until we reached Clifton. :) There was also a tunnel with a 12'7" clearance. Obviously, we cleared it.

After that trip we purchased the "Mountain Directory for Truckers and RVers". We then knew what those mountain highways were REALLY like and could choose the ones we could take comfortably.