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So when are they going to change traffic colors lights? I have missed a few. Especially troubling in large cities at night since they blend in with all the other lights.

Funny anecdote. At the DMV years ago to take my colorblindness test. Guy in front of me looks at test colors and says "red, green, red, blue." I promptly stepped up when it was my turn and said "red, green, red, blue." I passed.

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Traffic signal green is already optimized for colorblindness: the green looks white, so it is unambiguously distinguished from red and yellow. What do you propose as better?

This is actually more of a problem. The green blends in with the street lights. Red and yellow look the same, but they do indeed look different than green. I suggest adding shape -- much like we do with signage.

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