Spotted this on the way to work a while back. It made me think about problem solving, and how some fixes are just temporary solutions to the problem.
This seemed more like a “work in progress” kind of thing, with a small element of danger. But everything should be fine, if you just don’t mess with it.
I know someone was working here, and needed the manhole cover to remain exposed. I like how this didn’t need a sign, and still conveyed the message “I’m going to fix it tomorrow.”