I suppose the title of this post is wrong as really it would be a light for everyone however it would be colorblind friendly.
I got the idea because right now my son is semi-obsessed with traffic lights. He loves the colors asks when it will turn red or green and when it's green he'll ask why there's no arrow (on the regular lights).
And the other day we were riding home and he'd say, "green arrow, red circle, green circle, green arrows" and so on and so on.
But I was thinking what he'd see if he was colorblind. If it was bad colorblindness he'd only see grey/brownish circles or arrows (I think that's a good representation of the colors folks see).
So that got me thinking how to better design traffic lights for colorblind folk, since at night you can't tell if the top, middle or lower light is glowing but you can see the color.
Here's my concept. I'm sure that DOTs have looked into changing lights but I don't know why they haven't.
I chose to use the iconic colors of course but went with easily distinguishable shapes that have a behavior attached to them. Red X for stop, Yellow triangle for yield and Green circle for there's a turtle below you so drive away fast.