There is a sign on the 89 in Flagstaff saying 7,300 feet, but I can just ride cruise control from Phoenix through Flagstaff, to Page near the Utah border. I have not driven west on the 40, but east to Holbrook is boring. However, there are two routes from Phoenix to the White Mountains, and each of them goes through a canyon, and there is a steep mountain that passes 7,000 feet past Payson, with several steep and twisty sections.
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