Sign D14-4-DE of the Delaware Department of Transportation Federal Highway Administration Delaware Manual on Uniform Traffic Control Devices (PDF) (2011 Delaware supplement to 2009 edition ed.), Delaware Department of Transportation, p. 2H 10
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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