Sorry for dragging this to the top kiddies, but aussie andy said he had never seen this in print, and last night while perusing the latest FAR/AIM (which everybody should do every now and again, even though it is a nasty US rag) I found this little beauty.
7-5-6. Use of Runway Half-way Signs at Unimproved Airports
Don't expect anymore from me on this, as I actually think my presence is clouding the issue and I don't want to be responsible for your blood pressure blowing your head off

. Some on this thread understand, but unfortunately not most. I refer to my original post bemoaning the standard of education nowadays