State Route 78 (Arizona–New Mexico) State Route 78 (Arizona–New Mexico) Arizona State Route 78 (SR 78) and New Mexico State Road 78 (NM 78) are a pair of adjoining state highways located in eastern Arizona and western New Mexico linking U.S. Route 191 (US 191) and Arizona State Route 75 near Greenlee County Airport to US 180 northwest of Cliff, New Mexico. It is also known in its Arizona stretch as Mule Creek Road. The western terminus of SR 78 is located at a junction with US 191 and SR 75 at Three Way, Arizona near Greenlee County Airport. The highway heads northeast from this
Arizona State Route 93 approved a request from the Arizona Department of Transportation to eliminate all of US 89 south of Flagstaff. Thus, US 93 was extended to its current southern terminus at US 60 in Wickenburg. At its original northern terminus in Kingman, State Route 93 branched off of U.S. Route 66 (Andy Devine Avenue) at Louise Avenue, which is several miles east of where U.S. Route 93 and U.S. Route 466 branched northwest to Boulder City and Las Vegas. The old two-lane SR 93 headed east, south of and parallel to the new alignment of Interstate 40 until it came to the