Greenlist and redlist would fail in a global company. Plenty of cultures use red as a color that promotes positivity rather than a negative color. Japan has blue rather than green for their "Go" color. And so on.

I still think traffic lights would work as that’s almost a universal global standard (isn’t Japan the only exception?) and it works well in English

But I think we can agree that the goal when choosing these names isn’t really being concise and easy to use

Well yes, traffic lights are a problem, I’m red-green color blind myself. But the brain is smart enough to supply the right „color“ because it knows that red is on top and green is below. Wait a second, is that offensive towards the color green? ;-)

I've always wondered how you handle those lights at night, if you can't see the enclosure; and how you handle the occasional horizontal traffic light, which my town has one of.