Wikipedia:Naming conventions (U.S. county roads)

This Naming Convention is intended to standardize the naming formats used in articles pertaining to county roads or their equivalents in the United States.

The highway types covered by this convention have two naming formats—official name and article title—which can be the same. The official name is the naming format typically used by the county road commission, county road department, or the general public, and is what should be used to refer the highway in article prose. The article title is a disambiguated form obviously used for article naming, and should only be used in article prose if a sentence would otherwise be ambiguous. In cases where a local road name is the common name instead of an official designation, use that instead. If the same physical stretch of road changes names, such as Randolph Road, the article name should be the road name with the longest length and redirects should be created for the other names.