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San Francisco has high pedestrian traffic, but simply replicating a feature of San Francisco associated with walkability—e.g., its high density of storefronts—may be insufficient to induce increased walking in other cities. As urbanist Mariela Alfonzo argues, our understanding of individuals' decision-making about whether to walk is insufficiently robust: some studies emphasize the role of demographic characteristics, others the role of public transit availability, and so on, but walking decisions are made in complex contexts in which multiple conditions and needs inform individual choices.