Most significantly, generalists—such as planners and, one hopes, mayors—ask the big-picture questions that are so often forgotten among the day-to-day shuffle of city governance. Questions like: What kind of city will help us thrive economically? What kind of city will keep our citizens not just safe, but healthy? What kind of city will be sustainable for generations to come? These three issues—wealth, health, and sustainability—are, not coincidentally, the three principal arguments for making our cities more walkable.

