Conditions remain hazardous on I-17 south of #Flagstaff. Here's a traffic backup northbound at milepost 307, on the climb from the Verde Valley to the Mogollon Rim. Mark Trennepohl, ADOT's statewide road weather manager, describes the scene. #azwx pic.twitter.com/tei0FIjuPp

— Arizona DOT (@ArizonaDOT) January 21, 2018