Why Japan Has Blue Traffic Lights Instead of Green

Re:Why Japan Has Blue Traffic Lights Instead of Green by Izkata on Monday October 23, 2023 @11:18AM (#37986891)

Maybe not more colors, but more easily distinguishes them: https://www.psychologytoday.com/intl/blog/brain-babble/20150...

This is different from tetrachromacy, where some women really do see more colors: https://www.optimax.co.uk/blog/tetrachromacy-superhuman-visi...

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Re:Why Japan Has Blue Traffic Lights Instead of Green by galangalalgol on Monday October 23, 2023 @11:22AM (#37986982)

The mothers of some red-green colorblind children are tetra chromatic, so they actually see more. I think hexa chromatic also exists.

Edit: somehow didn't notice you'd linked this.

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Re:Why Japan Has Blue Traffic Lights Instead of Green by Izkata on Monday October 23, 2023 @04:16PM (#37990964)

I edited it in like under a minute afterwards, you may have opened the page right in the middle. I don't usually bother with an "Edit:" note if it's that fast.

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