Earlier quoted context omitted.
That's one point of view, if you're a goodie two shoes who automatically follows and agrees with every law and rule you ever heard of, even if it violates your own basic ethical values. Another point of view is that the state of arizona intentionally hates pedestrians and gratuitously creates roads that put their lives at risk when all they're trying to do is get home from the grocery store or whatever, a perfectly r…
Another point of view is that the traffic department realized that this was perhaps an unreasonably dangerous place for pedestrians to cross and posted a sign to that effect, in hopes of protecting pedestrians who might incorrectly judge/perceive the danger.
Merely putting up a sign sounds a lot more like the traffic department dealing with drivers' complaints of annoying jaywalkers in the least effort way possible.