A road sign located on the <a href="https://en.wikipedia.org/wiki/Pennsylvania_Turnpike" class="extiw" title="w:Pennsylvania Turnpike">Pennsylvania Turnpike</a> at the <a href="https://en.wikipedia.org/wiki/Allegheny_Mountain_Tunnel" class="extiw" title="w:Allegheny Mountain Tunnel">Allegheny Mountain Tunnel</a>, that prohibits vehicles carrying certain <a href="https://en.wikipedia.org/wiki/Dangerous_goods" class="extiw" title="w:Dangerous goods">Hazardous Materials</a> from the tunnel and directs them to exit the toll road at the exit.
<a href="//commons.wikimedia.org/wiki/User:The_Navigators" title="User:The Navigators">The Navigators</a>
<p>Vectorization of <a href="//commons.wikimedia.org/wiki/File:Prohibitionboard.jpg" title="File:Prohibitionboard.jpg">Prohibitionboard.jpg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Shanel" title="User:Shanel">Shanel</a>.
</p>
<br>The Placards, were pulled from the 2016 <i><a href="https://en.wikipedia.org/wiki/Emergency_Response_Guidebook" class="extiw" title="w:Emergency Response Guidebook">Emergency Response Guidebook</a></i>, a work of the United States Department of Transportation.