On the flip side, for those who are red/green colorblind, pink and orange are hard to see (kinda gray, I think). Red appears black. Hi viz yellow shows up as white.
There was a study published about this that I read on the interwebz somewhere (here maybe?). I'll see if I can find it...
ETA: http://www.dartmouth.edu/~sullivan/bike/colorbv.html



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