I believe it's fairly well established [1][2][3] that protanopia does make it harder to see red traffic lights, and increases reaction time. A couple studies I

I believe it's fairly well established [1][2][3] that protanopia does make it harder to see red traffic lights, and increases reaction time. A couple studies I looked at indicated that using the position of the light as compensation is quite effective, but it doesn't seem questionable that it is, in fact, more difficult to do. Color is remarkably useful for fast recognition of objects. Take this famous experiment [4] that showed the existence of synesthesia. People without synesthesia take much longer to locate the 2s in the field of 5s. But people with synesthesia who perceive numbers to have color can find them trivially. Anyway, as for this being offensive to you -- how is it any different than other facts like "short people have more difficulty reaching objects on high shelves" or "people born without a sense of smell cannot easily detect gas leaks?" These are simple facts, and there's nothing offensive about stating them. [1] http://onlinelibrary.wiley.com/doi/10.1111/j.1444-0938.2002.tb03045.x/pdf http://onlinelibrary.wiley.com/doi/10.1111/j.1444-0938.2002.... [2] http://www.ltrc.lsu.edu/TRB_82/TRB2003-000250.pdf http://www.ltrc.lsu.edu/TRB_82/TRB2003-000250.pdf [3] http://eprints.qut.edu.au/29558/1/29558.pdf http://eprints.qut.edu.au/29558/1/29558.pdf [4] http://en.wikipedia.org/wiki/File:Synaesthesiatest.jpg http://en.wikipedia.org/wiki/File:Synaesthesiatest.jpg