This is a Balcony, Beware
This one should give you a laugh because all balconies are above ground-level. Perhaps the concept is not-so-obvious to some though. The very definition of a balcony is a platform enclosed by a wall or balustrade on the outside of a building, with access from an upper-floor window or door.
Do we need to spell everything out to protect people who might not think as hard as they should? I guess this sign could prove that very notion. Better safe than sorry, as they say. And in this instance, I think we might be witnessing a case of overly cautious folks.