> Most suburbs in the United States are built very very intentionally to accomodate car and discourage other modes of transportation. Cul-de-sacs and winding roads only make sense with cars. The logistics of having a bus serve an area like that don't make sense, and even walking these winding, dead-end streets is a much bigger chore than, say, walking on relatively straight streets that try to connect point A to point B efficiently.
Well, one could make an on-demand share taxi/microbus service that serves between those cul-de-sacs and the closest avenue that is served by full size fixed-route scheduled buses.