Comment by StilesCrisis

Fun fact: Japan's traffic lights actually do use a blue-green color; it's not the same green that most countries use. ("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.")

https://www.atlasobscura.com/articles/japan-green-traffic-li...