Crosswalk signs on metal posts are fine, but here’s something that makes much more sense. This flexible LED crosswalk light that can be fastened around a tree, killing two birds with one stone. And it encourages trees in cities, which is always good.
It’s called the “Wearable Signal,” and comes from Korean designers, Gisung Han, Hwanju Jeon, and Jaemin Lee. They see it as an eco-friendly way to manage street traffic. They can be wrapped around any cylindrical pole, but trees are obviously best.