This isn't the first place I've seen this -- back in December of 2009, in Manhattan (midtown somewhere, GPS says 53rd between Park and Lexington), I happened up

This isn't the first place I've seen this -- back in December of 2009, in Manhattan (midtown somewhere, GPS says 53rd between Park and Lexington), I happened upon this sign [1] and snapped a photo. Uses green and blue instead of green and red, and is oriented horizontally instead of vertically, but appears to be official. [1] http://imgur.com/IXv0WqB http://imgur.com/IXv0WqB