https://www.azdot.gov/media/News/news-r ... -i-40-i-17
Of primary concern to most HAZ users is that northbound I-17 will be repaved on the 30 miles south of Flagstaff. If you make weekend trips up north this summer, this could cause delays during peak traffic times.
Also worth noting is that the projects on I-40 west of Flagstaff will reduce traffic to 1-lane in each direction all summer long. Hikers heading to Grand Canyon may opt for US180 from Flagstaff instead of I-40 to AZ64 via Williams.
All the projects are scheduled to be completed by fall 2018, but even ADOT acknowledges this is unlikely to be the case!