Columbia County (NY) Route 21C shield. Public domain.
<a href="https://en.wikipedia.org/wiki/User:TwinsMetsFan" class="extiw" title="w:User:TwinsMetsFan">TwinsMetsFan</a>
2006-12-01
Own work. Based on template found at <a href="//commons.wikimedia.org/wiki/File:US_DOT_FHWA_MUTCD_SHS_2004_3-7_M1-6_450x450mm_00.svg" title="File:US DOT FHWA MUTCD SHS 2004 3-7 M1-6 450x450mm 00.svg">Image:US DOT FHWA MUTCD SHS 2004 3-7 M1-6 450x450mm 00.svg</a>.