I confirm what Matthew said. We took several routes to Salt lake city and Provo. The traffic can be quite aggressive in commute time.
For an adventure, go over the back way, up towards Guardsman Pass. It was a shorter trip from Deer Valley, about the same (25-30 mins) from park city. Much more interesting (curvy) drive. Watch for Moose!
It's about 18 miles or a 30 minute drive.
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