I-70 in western Colorado, which looks a lot like Utah. Colorado hadn't been a major stopping point on the itinerary because of its unpredictable spring weather, so, unfortunately, this section will be short. Maybe another time, Colorado.

Grizzly Creek rest stop

Vail Pass, elevation 10,662 ft. Colorado boasts a collection of some of the highest mountain ranges in the Lower 48, and not even the interstates can avoid having to climb into the higher elevations to get past them.