Oklahoma state highway shield approximated to the 1948 standards. No actual standard is known to be accessible on the Internet for this shield, so this shield is completely approximated by photos and surviving specimens.
As a road sign found in the federal MUTCD, this sign is not copyrightable. Any copyrightable elements were first published in 1924, making it public domain due to age anyway.
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.
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