In the suburbs you can walk in the street or through people's yards ("gardens") along the edges and no one really minds. Everyone tends drive instead, though, since there aren't any well-connected walkways that lead to any place you'd really like to get to.
In general, people do not walk down the street at all. I used to live in a place that looked a bit like this (except spread out a bit more) in Alabama, and while you'd once in a while see someone walking down the street, it was pretty rare except for kids too young to have cars (under 16, basically).
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