24" x 24" (600mm x 600mm) Arkansas State Highway 980 shield. Based off of photographs, as I do not have the specifications.
No machine-readable author provided. <a href="//commons.wikimedia.org/w/index.php?title=User:Luokou&amp;action=edit&amp;redlink=1" class="new" title="User:Luokou (page does not exist)">Luokou</a> assumed (based on copyright claims).
17 October 2008 (original upload date)
No machine-readable source provided. Own work assumed (based on copyright claims).