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A popular highway between Flagstaff and Sedona will be closed to through traffic each night starting Monday and lasting through the fall.

State Route 89A between Flagstaff and Oak Creek Canyon will be closed nightly from 8 p.m. to 5 a.m., according to the Arizona Department of Transportation. The only nighttime openings will be on major holidays.

The 8.4-mile stretch of highway has required weekday restrictions since March 6. Those will continue through the fall, with no restrictions on weekends and major holidays.

The night closure extends from Griffith Spring south of Forest Highlands to the overlook above the switchbacks.

The road restrictions have been needed while the U.S. Department of Transportation works on adding turning and passing lanes as well as wider shoulders to increase safety on the congested mountain highway.

During weekdays, highway crews will reduce traffic to one lane between 7:30 a.m. and 4 p.m., with a pilot vehicle leading motorists through the construction zone. Commuters and others will have a window between 5 a.m. and 7:30 a.m. and 4 p.m. to 8 p.m. without construction delays.