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Licensing

Public domain This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices , sign number M1-4, 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.