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Thinking in terms of the several "color blind" people that I know, I'll bet a good case could be made that the black letters on red background were not contrasty enough.

I wonder if an amendment to the law needs to be made just on that basis - IOW, if one cannot distinguish between green and red, which are pretty contrasty to those of us who see colors "normally" it's probable that the sign would be seen as merely a blank piece of paper.

I think the law should specify 1 inch block letters (ALL OF THEM) in white on a black background, none of this white on glass (try that with macular degeneration) or 1 inch caps followed by lower case at 3/4 of an inch.

And of course, penalties for non-compliance.