US Highways in Arizona
With US Highways certified but no one to maintain them, Arizona created their State Highway Commission in 1927. They oversaw the purchase of the needed right-of-way, as well as the signing and maintenance of the new roads. Most states also had this issue of having the certification for a path as a US Highway but no set roadbed.
All of Arizona's largest cities were interlinked in the system from the start. US 80 was the main artery for Phoenix and Tucson, US 180 gave a connection to Flagstaff and the Grand Canyon, US 60 and 80 carried traffic to Los Angeles and San Diego respectively for out-of-state access, and US 70 took you into southern New Mexico and Texas, while US 66 took you to Albuquerque via the northern half of the state.