You know, I never thought about that actually: good point. Still no reason both couldn’t be used together for the best of both worlds though.
Yeah. Green does have its advantages though: in addition to being perceived as meaning “safety”, it’s also likely unique in color from all the other lights in a typical building & thus should stand out & be locatable easier, along with being more visible in darkness according to Wikipedia, so maybe green should be the standard color in the US.
More like arrows alongside both the ISO exit symbol & the word “EXIT” for the best chances of both visibility & understanding (& to just have the best of both worlds together as I said).