All good advice. When we drive from Denver to ID, we take I 80. I have been on it in the snow, and it isn't too bad, although the blowing is annoying for sure. I 80 roads are less steep then I 70, and there are many snow blocks along the highway to prevent drifts. But I 80 is lonely and boring, and I 70 is a more beautiful drive for sure. I 70 is mountain driving; I 80 goes over the mountains as well, but it is flat plains instead.