Ryan Avent tackles walkability:
...walkability isn’t just about ample sidewalks, it’s about design. If you build a lowish density neighborhood, separate the homes from the retail, and surround the retail by roads and parking lots, well, you’re not going to get walkers. If you try to make the development more like a small town, however, with residences over retail on the main strips, distributed retail throughout the neighborhood, and a fairly compact design, then you can get real walkability, to a certain extent, even with single-family homes and yards. And you can also follow the model in New England (and old England, actually) and drop that development onto a commuter rail line or transit connection, and then you’ve reduced driving still more, even as most or all residents of the neighborhood own and frequently use cars.
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