While there are no planned closures in the Valley over Labor Day weekend, there's sure to be traffic on I-17 as Phonecians escape the heat.
As of Friday afternoon at 4 p.m., there are already significant delays on the route to Flagstaff.
The Arizona Department of Transportation said there is a 22-mile backup on the freeway northbound from Anthem to Sunset Point.
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Those delays are expected northbound through the evening Friday and southbound in the area Monday as people return to the Valley.