By September 1967, over of I-40 had been constructed or rebuilt from sections of US 66, with another under way. I-40 around Flagstaff was completed and opened to traffic in 1968, bypassing US 66 and US 89 through town. By 1971, almost all of US 66 east of Flagstaff had been rebuilt into I-40, save for the city streets through Winslow, Joseph City and Holbrook. I-40 had also been completed around Flagstaff and west to the junction between SR 64 and US 66 east of Williams. Another section of I-40 was complete between Seligman and Ash Fork, with a tiny section completed just east of Ash Fork. Almost all US 66 had been converted into I-40 between Kingman and Topock as well, save for a section east of Topock and a section south of Kingman. A small section of I-40 had also been completed between Kingman and a junction with US 93 about south of Hackberry.