Yes, I've been on it 46 times south bound and 39 times north bound, they are two different roads, depending on which direction you travel .
http://www.motorcycleroads.us/roads/az_us191.htmlI've traveled it on the bikes oilhead and '81 R65 and with my CRX and Z3 .
The road is great, but unforgiving I would not do it in inclement weather .
There are no guard rails, only a few places, where large boulders have been placed to prevent you from going a thousand feet or (more) so to the bottom .
If someone doesn't see you go off of the road, or your vehicle doesn't catch on fire, no one is going to come looking for you .
No cell phone service for pretty much the entire 90 some mile length form Hannigan Meadow to Clifton, you are truely the master of your own destiny on this road !!!!!!