I think that sort of graffiti/art for-and-by the workers is common on bridges in the Bay Area, if not elsewhere... http://en.wikipedia.org/wiki/Bay_Bridge_Trol

I think that sort of graffiti/art for-and-by the workers is common on bridges in the Bay Area, if not elsewhere... http://en.wikipedia.org/wiki/Bay_Bridge_Troll http://en.wikipedia.org/wiki/Bay_Bridge_Troll