Image:MA Route 18.svg

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600 mm by 600 mm (24 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 square, but all signs I have seen round the corners.

• List of numbered routes in Massachusetts
• Massachusetts Route 79
• Interstate 495 (Massachusetts)
• Interstate 195 (Rhode Island-Massachusetts)
• List of highways numbered 18
• Massachusetts Route 3
• Massachusetts Route 140
• Massachusetts Route 104
• Massachusetts Route 18
• Massachusetts Route 28
• Massachusetts Route 17
• Massachusetts Route 19
• Wikipedia:WikiProject Massachusetts state highways/Completion list
• Massachusetts Route 123
• Massachusetts Route 53
• Massachusetts Route 139
• Massachusetts Route 106
• Massachusetts Route 58
• Massachusetts Route 105
• List of crossings of the Taunton River