Yep, here is the exact email from him himself.  

 TABWed, Feb 1, 2006 at 2:12 PM 
To: pghbridges@hotmail.com 
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Hello, I was just asking if it would be okay with you if I put the Capital Beltway sign you made onto Wikipedia (for inclusion to the Capital Beltway article) and of course credit you or your site with it.  Thanks,

Bobby H

  Bruce C  TABWed, Feb 1, 2006 at 2:14 PM 
To: Bobby H  
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Yes.
Bruce at pghbridges.com