If a paper map has that feature Google maps should have it as well. It of course can have more features and _can_ be integrated with some kind of a weather + traffic warning system. But it doesn't have to. The way I interpreted the original comment was that the road had snow on it and user was baffled how come Google Maps didn't know about it.
I updated my post to note that it was a no winter maintenance road. I originally took some liberties assuming that most people would recognize it as such, but I guess those who don't live in extreme climates may not be familiar with them.
