I saw the following notice in the London Borough of Hounslow:
I don’t know how it seems to you, but I think it would have been easier to say “All water children should be fenced”.
This borough also had a sign saying “DANGER: River”. Very true, but I looked in vain for a notices saying “DANGER: Road” or “DANGER: Junk food outlet” or …
But it is not only Hounslow. In the borough of Richmond, there is a puzzling sign saying, “This gate will be closed half an hour before closing time”.