English: 750 mm by 600 mm (30 in by 24 in) Massachusetts Route shield, made to the specifications of the 1996 edition of Construction and Traffic Standard Details (sign M1-5). 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.) The outside border has a width of 1 (1 mm) and a color of black so it shows up; in reality, signs have no outside border. The specs actually do not show the curve on the outside border, instead making it a perfect rectangle, but all signs I have seen round the corners. Note: The specs specify 900 mm by 600 mm with Series D font for four-digit routes. However, real signs are 750 mm. Some use Series B, while others squeeze in Series C. This image uses Series B.