One December several years ago, we drove across I-70 from Vegas to Colorado Springs to adopt a couple of greyhounds. The weather was supposed to be "clear" but some stretches of road were icy. Vail Pass had snow on the road and it was snowing as we drove. No chains required then but you have to consider that when you cross the Rockies either I-70 or I-40. We came back using I-25 south to I-40 and headed west without a problem. From where we live (Las Vegas), we use I-10 in the winter to go across the country. It's longer but lower elevation and farther south.
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