My job will require me to drive all over Colorado, Utah and Wyoming. One of the places I have to go to goes over 3 passes that are between 10,000 and 11,000 feet, one of which is Red Mountain. It was featured on a show called Dangerous Drives. 47 miles of switch backs and 1000 foot drops and no guardrails. You will have time to contemplate the mistakes in your life as you plummet into the canyon.
Anyway, I have been over that pass, and most others, in full on white out blizzards. One time, they closed the road after I started up as the weather conditions were so bad. When I came down the other side, the Sherrif and the CDOT folks were quite amazed that I made it. I have also been on roads that if it were not for the reflector markers on the little poles, I would not know where the road is. Kind of take it on faith that there is road beneath the rubber.
Ahhh. You're one of
those admins.
Since you're curious about snow, here are a few pictures of the valley I live in and one video of my friend
http://imgur.com/a/t7dXe
http://www.youtube.com/watch?v=HIn5FEnYXO0
He needs to come up with some kind of sled arrangement for the trip back down

. The tricky bit would figuring out how to carry the bike on it while still being able to carry it on the bike...
But once he's worked out the kinks, I reckon he could make a fortune

.