Despite California's lack of recognition of US 66 as an active highway, the American Association of State Highway and Transportation Officials (AASHTO) recognized the new western terminus of the highway at US 95 in Needles, across the river from Topock. The section of US 66 through Arizona remained unaltered until 1979, when AASHTO approved a request from California and Arizona to truncate US 66 from Needles to a junction with I-40 and US 666 in Sanders. However, the Arizona Department of Transportation (ADOT) continued to recognize the US 66 designation west of Sanders, establishing a signed western terminus at I-40 in Kingman.