The Arizona Department of Transportation is advising drivers who use Route 66 in Flagstaff to expect a traffic shift. The shift is needed as crews construct wing walls for the Rio de Flag Bridge Replacement Project. The eastbound lanes will be shifted to the north, by one lane, and the left turn lane to Humphreys Street will be closed. Also during the shift, eastbound traffic will be detoured to north San Francisco Street to west Columbus Avenue to access north Humphreys Street. Two lanes of traffic will be maintained in each direction on Route 66 while work is under way. Work is scheduled for weekdays from 6 a.m. until 5 p.m. through next Friday. As always, drivers should proceed through the work zone with caution, slow down and watch for construction workers and equipment.