ADOT says drivers should prepare for traffic shifts and lane restrictions on I-40 at Exit 191 in west Flagstaff as crews continue project work to replace a bridge. Eastbound I-40 will be reduced to one lane and traffic shifted to the north side of the roadway beginning at 6-pm Friday. A similar shift will occur next Thursday for the westbound lanes. Restrictions will be in place through mid-fall. Ongoing restrictions at the location include the closure of the on-and-off-ramps as well as the crossroad under the bridge. The project is scheduled to be completed in fall 2022.