This is a comment for the Australian users.
I am under the impression and have been for many years now and maybe I'm wrong, that in Australia, the standard for labeling stair directions is always up, even if you are at the top of a flight, the label and arrow should say up.
The theory is that when-ever you see a flight of stairs drawn on a drawing you instantly know that it is rising in the direction of the arrow. This means that if it is not labeled then you know which direction it is running, which is Up
Are there other Australian firms here that use that use that theory?