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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{{Information |Description=24 in by 24 in U.S. Route shield, made to the specifications of the [http://www.erl.dot.state.ia.us/APR_2006/RS/content_eng/rd41.pdf Iowa Department of Transportation's Standard Road Plan RD41]. Uses the [http://www.triskele.com
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