DescriptionUS91.svg English: 600 mm × 600 mm (24 in × 24 in) U.S. Highway shield, made to the specifications of the 2004 edition of Standard Highway Signs
DescriptionUS91 (1961 cutout).svg English: 24 in by 24 in (610 mm by 610 mm) California-style U.S. Route shield, made to the specifications of the 2002