I'll never understand why we continue to design our suburbs for cars and driving with no attempt to encourage walking. Instead, we seem to discourage walking through a lack of sidewalks, concentration of destinations surrounded by parking lots a mile wide themselves, and burying houses in subdivisions that require almost a mile walk just to get out of.
The world outside presumably filled with undesirables.
The lack of connectivity discourages through traffic (i.e., undesirables), and meandering streets that run every which way helps artificially draw out the walking distance between any two points, further hobbling any desire or ability for people who walk/take transit to visit (i.e., undesirables).
Suburbs weren't always like this, we had walkable suburbs a long time ago, and in some places we have them again. But the most typical archetype of a suburban neighborhood is an exercise in extremely class-conscious design.
Despite the revitalization of urban cores across the US, the mentality that drove the construction of these suburbs still remains. The thing that jumps into my mind is the furor over Seattle's extension of light rail into Bellevue - a high-income suburb. All of the opposition boiled down to "but the undesirables!".
Until we shake the whole "urban = poor" thing, we'll continue to architect our suburbs in this way.