The 1927 plan included 27 state routes, most of which were simply dirt roads.

Until 1942, the state route marker signs contained a Native American swastika that were used by Navajos, but were removed after the U.S.'s entry into World War II against Nazi Germany which had a reversed swastika as its emblem and became strongly negatively associated with the Nazis.

The Arizona Department of Transportation (ADOT) internally recognizes Interstate Highways, U.S.

[3] Designations listed under Highway Logs and GIS data however, use the Arizona Transportation Information System (ATIS) nomenclature.

[3] State Business Route 79 under ATIS nomenclature is referred to as "SB079" and SR 93X is "SX093".

Currently, the Arizona Department of Transportation recognizes 26 state designated routes under the Parkways, Historic and Scenic Roads Program.