Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain. Traffic control devices contained in this Manual shall not be protected by a patent, trademark, or copyright, except for the Interstate Shield and any other items owned by FHWA.

No provisions of the supplement modify this provision of the MUTCD.

24 in by 24 in (600 mm by 600 mm) Wisconsin State Highway shield, made to the specifications of the sign detail (sign M1-6). 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.)