In Wyoming during the winter I've driven that amazing little piece of interstate between Casper and Cheyenne as well as the treacherous little highway between Billings and Casper. Times when you would start off your trek with a little falling snow only to find your self stuck in a white out situation wondering what the heck you did wrong, how do I get out of it, and how do I get off the damn interstate without wrecking the car. Here is a little dash board camera video highlighting some  terrible winter driving. Plan ahead when you drive in Wyoming in the winter. Especially the spring. It snows in the spring here as well.