Interesting. I supposed I'm just spoiled by Northern California weather! In any case I don't mean to suggest that traffic lights should be only different shap

Interesting. I supposed I'm just spoiled by Northern California weather! In any case I don't mean to suggest that traffic lights should be only different shapes but rather that shapes be used in combination with colors. I feel like it would be an easy transition to make as the shapes would be a supplement to the existing system and thus traffic signals can be changed gradually. The article's idea of making the green light blue would certainly help me but it does nothing for people who are completely colorblind and present the problem of transitioning a standard.