TLDR

"The government decided to compromise. “In 1973, the government mandated through a cabinet order that traffic lights use the bluest shade of green possible—still technically green, but noticeably blue enough to justifiably continue using the ao nomenclature,” Allan Richarz writes for Atlas Obscura."

So their lights are "blue" for other reasons...but hey technically still green for international compliance.

As a person with red/green (deuteranomaly) issues that needed a 7 page packet from my eye Dr. so I could get my licence...

I'd super love if America changed to "blue"(technically not blue, just the minimum amount of green hue) myself.

Waaaaay less people are blue colorblind.

• https://en.m.wikipedia.org/wiki/Color_blindness

Also shout out to Androids' spiffy accessibility ♿👀 options!