Around here, painted notices on the road warning of an upcoming stop sign usually read ...
Here's an example, although what I see around here usually has the words placed closer together; maybe one line break and not three or four.
I think it's assumed that a driver will read the word that's closest to them first, and thus read "STOP" before "AHEAD". I never do that, though; instead, I see both words at the same time, so to my eyes it registers as "AHEAD STOP". Am I in the minority in reading such pavement markings that way? Do most drivers really instinctively read pavement markings from bottom to top?