This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices, sign number M1-1, which states specifically on page I-1 that: 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.

本作品含有在一個或多個司法管轄區内受商標法保護的內容。任意使用以致於侵害到商標擁有者的權益將可能會面臨刑事責任與民事賠償。請使用者使用前自行查明相關法律規定並承擔一切風險與責任。參見我們的免責聲明。使用本商標並不表示由維基共享資源或維基媒體基金會對持有人的背書，反之亦然。 此標籤不表示文件的著作權狀態。任何文件在附有此標籤的同時還需要一個有效的著作權標籤。請參閱許可協議說明頁面以了解更多資訊。

600 mm by 600 mm (24 in by 24 in) Interstate shield, made to the specifications of the 2004 edition of Standard Highway Signs (sign M1-1). Uses the Roadgeek 2005 fonts archive copy at the Wayback Machine. (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.) Colors are from [1] (Pantone Red 187 and Blue 294), converted to RGB by [2]. 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.