82% of Americans do not live in cities. Rather, they live in areas classified as urban (which really means not rural) by the census bureau. Here's the definition: "To qualify as an urban area, the territory identified according to criteria must encompass at least 2,500 people, at least 1,500 of which reside outside institutional group quarters."
Yes, I'm guessing that many of those urban areas are within half an hour of a freeway--though this may be less true in the West. But the vast majority of those 82% don't live in places that are remotely walkable.
Yes, I'm guessing that many of those urban areas are within half an hour of a freeway--though this may be less true in the West. But the vast majority of those 82% don't live in places that are remotely walkable.