ADOT is warning of possible long delays starting tonight on Interstate-40 in Flagstaff. Westbound I-40 will be narrowed to one lane between Country Club Drive and I-17 between 7 p.m. Wednesday to 6 a.m. Thursday. Eastbound I-40 will be narrowed between I-17 and Country Club Drive overnights through Friday. The westbound I-40 off ramp at I-17 will be closed from 7 p.m. Wednesday through 6 a.m. Thursday. Use the Butler Avenue exit as a detour. Both on and off ramps of eastbound I-40 will be closed from Thursday at 7 p.m. until Friday at 6 a.m. Drivers can use the Country Club Exit as a detour. The closures and lane narrowing is due to ongoing pavement work on I-40 in Flagstaff. Speed limits will be lowered to 45 miles-per-hour in the work zones. ADOT reminds drivers to slow down and use caution around workers and equipment when pavement work is underway.