Green always has a more natural" (safe, go) association,
while red is much more "alarming" (danger, hot, STOP !)

However, EXIT signs in the US used to be red, until recently.

Quora: Why are exit signs green nowadays?

And not to China's leader Mao, who proposed to change the colors of traffic lights, since red was considered the color of progress, prosperity...

Traffic lights in China (25 Aug 1966)

And in some areas of our world, STOP signs still aren't necessarily red...

They Blue It – Now I Know

Oorspronkelijk geplaatst op Quora: Why is green the go color and red the stop color?"