They've stuck these signs up around my campus at various places. At first, I thought it was just near some of the places they're doing construction, but no, it's all around.
That's right, we cannot be trust to walk safely without warnings. I'm sure there's a pithy comment about standing on your own two feet in there somewhere.
It's absolutely emblematic of the mania for safety that has gripped our current society. Everyone must be safe. Everyone must be appraised of every possible risk, so that nobody is culpable if you get hurt.
I'm surprised they don't have these next to every stairwell.