I'm not familiar with OSM routing, but these roads enter and cross some of the most inhospitable mountainous terrain in the United States.
Some, like the 101 mile long Magruder Corridor ( https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5109483.pdf ) are only open a few months of the year, or never open at all ( especially when fire fighting is going on ). So it would behoove the mapper to research the routes in detail. Elk Mountain Pass in Wyoming is 11,171ft and has 14 passes over 10,000+ alone. Even if they are 'open' the weather can make conditions untenable in a heart beat. The US Forest Service sometimes requires that an axe,shovel and a bucket be carried in your vehicle when traversing on USFS property and roads during fire season and states follow the lead of the USFS. Hmmm ... maybe there needs to be 'Local Knowledge' tag. Sigh. Makes me home sick. Michael <https://www.dangerousroads.org/north-america/usa/7286-elk-mountain.html>
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