This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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I, SPUI, the creator of this image, hereby release it into the public domain. If that cannot be done for any reason, including the nonexistence of a way to release a work into the public domain, I release it (or my changes in the case of a derivative work) under the following license:
This image is copyrighted. The copyright holder has irrevocably released all rights to it, allowing it to be freely reproduced, distributed, transmitted, used, modified, built upon, or otherwise exploited in any way by anyone for any purpose, commercial or non-commercial, with or without attribution of the author.
750 mm by 600 mm (30 in by 24 in) U.S. Route shield, made to the specifications of the 2004 edition of Standard Highway Signs. (Note that there is a missing "J" label on the left side of the diagram.) Uses the Roadgeek fonts. (United States law does not permit the copyrighting of typeface designs, and the fonts are meant to be copies of a U.S. Government-produced work anyway.)
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The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
Interstate 26 (abbreviated I-26) is an east-west main route of the Interstate Highway System in the Southeastern United States. ... U.S. Route 11 is a north-south United States highway. ... U.S. Route 11 is a north-south United States highway. ... U.S. Route 11 in Virginia runs north-south through the western part of the state, parallel to Interstate 81. ...