I have some images uploaded, but not yet keyworded, from this outdoor installation in Boston: https://www.rosekennedygreenway.org/public-art/currently-greenway/glow/
I am hesitating putting them on sale because I'm not sure if these are considered works of art that should only be submitted in wider context.
One other photographer has images of these signs available on alamy. He has them marked royalty free, and NOT as property--but I wonder about that since the exhibition states they are on loan from the people who own them. That sounds like property to me.