600 mm by 600 mm (24 in by 24 in) U.S. Route shield, made to the specifications of the 2004 edition of Standard Highway Signs. (Note that there is a missing "J" label on the left side of the diagram.) Uses the Roadgeek 2005 fonts. (United States law does not permit the copyrighting of typeface designs, and the fonts are meant to be copies of a U.S. Government-produced work anyway.)
This is meant to be the shield used in New Hampshire and Maine. The locations of the BY-PASS and 1 are approximate, as I do not have exact specs.
Own work
SPUI