This image is from a collection commissioned by the United States Department of Transportation and designed by AIGA. It is copyright-free, and is available
here.
{{PD-AIGA}} This image is from a collection commissioned by the United States Department of Transportation and designed by AIGA. It is copyright-free, and is available [http://www.aiga.org/content.cfm/symbolsigns here]. [[Category:Public Information Symb
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