the series of Fire-exits. It's interesting how the emergency exits are generally labelled "fire exit" in the UK: it naturally hints how most of the emergent situations are related to fire.
the staircase always looks like an interesting collection of layers to me
Japan, in contrast, just happens to have any kind of natural disaster you may have to escape from: which may be the reason why they are all labelled "emergency exit" instead of naming a specific emergency situation.