As a person tours the city, he or she might notice that
there are actually different breeds or species of Yield to Pedestrian
signs. These triangular types are more mobile. I suppose if someone hits
it head on and drags it across the intersection it at least does not leave
a nasty pothole behind where it is attached to the ground.
Sometimes they move this way or that way, wobble
a bit, spin around, but miraculously don’t fall down!