From Names to Numbers: The Origins of the U.S. Numbered Highway System - Highway History - FHWA

From Names to Numbers: The Origins of the U.S. Numbered Highway System - Highway History - FHWA

How America went from hundreds of unofficially named auto trails (National Old Trail, Lincoln Highway, Ozark Trail, Dixie Highway, to name a few) to a national numbering system for US Highways in 1926. This article also explains how the Chicago-Los Angeles was almost numbered US 60 and why it was changed to US 66.