I'm glad to hear they made it.

Driving on unfamiliar and poorly maintained mountain roads in snow can be very risky. I've been told every year a couple of people drive off the mountains in Virginia because they misjudge where the road is under the snow and ice. Ice builds up on rock faces where the road is cut into the face of the mountain and also beside the road producing overhangs that make it look like the road is three or four feet farther out than it really is. If you get two wheels out on the overhang and it breaks off suddenly it often doesn't matter if you have a 4WD or not.

With slopes below roads often being vertical to forty-five degrees the vehicles slide or tumble down. If they slide into a snow bank or a snow bank falls after them the vehicle can be lost until spring thaw.