I came across an unusual traffic sign (in what appears to be a stock photo), having a black octagon with a red crossed out circle:
What does this sign mean, and where is it from?
Edit not from OP Link (http://jameslano.squarespace.com/prints/6ix) provided by @Nayuki:
The above seems very likely a copyrighted photograph that was (a) published without attribution and (b) cropped. I am hoping that crediting "JL" and showing the entire image is not offending. It is clear at least where the image was captured and that the central part of the sign, assuming symmetry, is more likely octagonal rather than hexagonal.