English: Based off pictures found at the following links: [1];[2]. A 1956 Specification Arizona State Route Shield, traced from a picture of a real 1927 shield and sized to match File:US 80 Arizona 1958 West.svg. The Swastika on the shield is historically accurate and represents a Native American design and is not to be associated with Adolf Hitler or the Nazis.
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 supersede this provision of the MUTCD.
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