[stcredzero]

Simple. Have a society that values things working correctly. The nicer parts of Stuttgart used to be like this. Jaywalk? People look at you like you're scum. See trash? You didn't ever see a single scrap of trash, other than around those stalk-like cigarette butt receptacles. In fact, when I visited in 2000, every outdoor trash receptacle in Stuttgart was completely airtight by law. I had the strange (for me) experience of walking through a major urban area without once smelling trash.

Here in SF, in some parts of the city, you have to keep an eye out to avoid human feces.