Between Kingman and Seligman, I-40's more southerly and more direct path diverges from former US 66 by approximately , putting considerable distance between former US 66 and the current Interstate. SR 66 and Crookton Road comprise the route of old US 66 between Kingman and Seligman. The state highway designation currently covers just of a section east of Kingman. As US 66 headed northeast from Kingman on SR 66 and paralleled the Santa Fe Railway, the highway made a gradual northeastern curve about from Kingman, and entered another mountain range, where it arrived at the town of Hackberry.