I know its not really the answer to your question, but I love how we all grind to a hault, making half cooked attempts at 'essential journeys' when it snows... airports come to a grinding hault too. By contract when I went snowboarding a few years back, we landed in a place with tonnes of the white stuff, and proceeded to get taxi's around the area, again through mountain roads covered in snow. I know they're used to dealing with snow in such areas, but you would think we'd do a little better than our current efforts of throwing grit around and sliding about on summer tyres crashing into each other.