Taking the back way from Provo to Show Low, Az. you get to do a LOT of shifting coming out of Apache National forest. ....and I was driving an S-10!

 

Colorado 550 from Ouray to Silverton
This two lane highway in southern Colorado is well known for being treacherous. It has S-curves winding through three San Juan Mountains passes. It's a popular highway for recreational vehicles and late fall's wildlife migration and deer hunting season put thousands of animals on the move and crossing roadways. During the winter it is also directly in the path of a major avalanche zone and theres no gaurd rails either it was featured on speed chanels dangerous drives verry steep grades i plan to go there this summer on my bike im pretty sure 550 eats all these highways for brekfast and going out of denver westbound is pretty tough i blew up a 2003 chevy 3500 5.7 boxtruck going up that hill in july but it doesnt compare to 550 check it out on youtube or you can put million dollar highway in google its pretty gnarly

 

Eastern WV ain't a cake walk. I smoked a clutch in PA but nearly lost the rig in WV

 

I never even considered that aspect in the "degree of difficulty" factor, but it's definitely an issue up in the mountains, especially.

I grew up back east in western PA and as I recall the road kill was much more back there. The problem out west is the animals tend to be bigger. A full grown bull elk will demolish anything smaller than commercial-sized vehicles, hit just right.

 

rock slides are also everyday buisness on 550 as well and avalaches in the winter for the most part its sherr clifs with no gaurd rail no shoulder and in some places shoulder is falling off do to erosion my vote for #1

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here is a picture of 550 just to give you an idea its like a lion verry beautiful but verry deadly

 

Two laners through the mountains are spooky anywhere....but for a major interstate run, Cabbage Hill (Emigrant Hill I-84) between Pendleton, OR and LaGrande, OR is no joke, especially going west towards Pendleton.

 

i live in PA and the ups an downs never end...my little Geo Tracker (shoebox) would never go over 35-40 on most of the hills

 

CA 177 / 62... east of Palm Springs, connects I-10 to I-40 w/out having to go thru Blythe. The hill is 8 or 10 miles at a respectable grade, but @ 120F outside temp and the engine already runnin' hot.. I turned off the a/c, turned on the heat, alternated between 1st and 2nd gear and hoped for the best ... Not recommended in July.

 

I've concord 7 out of 10 of those list grades with 80k in a tractor trailer. The 3 in Colorado all done in the snow! They will definitely separate the men from the boys!

 

Uphill never bothers me. Downhill...different story.

YouTube- Crazy loud Peterbilt Logging truck on Iron Mountain! AWESOME!