<p>24 in by 24 in (600 mm by 600 mm) Louisiana Highway shield. Uses the <a rel="nofollow" class="external text" href="http://www.n1en.org/roadgeek">Roadgeek 2005 fonts</a>. (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.) The outside border has a width of 1 (1/16 in) and a color of black so it shows up; in reality, signs have no outside border.
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Everything about this is approximated from sign photos.
<a href="//commons.wikimedia.org/wiki/User:Fredddie" title="User:Fredddie">Fredddie</a>
<span class="int-own-work" lang="en">Own work</span>