Phoenix Area Highways

[The Ghostbuster]

A Business 60 designation along old the old US 60 (and old US 70/80/89) alignment through Phoenix, Tempe, Mesa, and Apache Jct. was probably considered unnecessary. There was once a Business 10 in Phoenix: https://www.aaroads.com/interstate-guide/business/ir-010/#arizona, although it seems to have been decommissioned around the time the last segment of Interstate 10 was completed in 1990.