The Arizona Department of Transportation is advising motorists who use Historic Route 66 (B40) in Flagstaff to expect traffic shifts as crews construct drilling shafts for the Rio De Flag Bridge Replacement project. The work, which is currently underway, is scheduled through Friday, May 14.

Friday, April 2 through Monday, April 12

• Historic Route 66/ State Route 40B will be opened to normal traffic operation with the exception of intermittent westbound right-lane closures.

The following traffic shift will occur from Monday, April 12, until Friday, April 30:

• The east- and westbound travel lanes will be reduced to one lane in each direction and shifted to the south side of the roadway.
• The left-turn lane to northbound US 180 and Sitgreaves Street/Santa Fe Avenue will be closed.

The following traffic shift will occur from Friday, April 30, until Friday, May 14:

• The east- and westbound travel lanes will be reduced to one lane in each direction and shifted to the north side of the roadway.
• The left-turn lane to northbound US 180 and Sitgreaves Street/Santa Fe Avenue will be closed.

In addition, the following restrictions will be in place through May 14:

• The speed limit will be reduced to 25 mph between Butler Avenue and Beaver Street.
• A 12-foot vehicle width restriction will be in place.

During the traffic shift, eastbound Historic Route 66 to northbound US 180 (Humphreys Street) traffic will be detoured to east Butler Avenue to north San Francisco Street to west Columbus Avenue to access north US 180 (Humphreys Street).

Drivers should avoid the area and use alternate routes if possible. If drivers find it necessary to travel through the work zone, proceed with caution, slow down and watch for construction personnel and equipment.