" Imagine you have just moved to a new city, one that has extensive urban sprawl and lacks good mass transit. Getting around requires a car. The opportunities for random social interaction are few, because of the design of the transport system. Being in a car militates against easy face-to-face interaction and chanced-upon conversation; every sight of another human being is mediated through glass. By contrast, in a densely packed neighbourhood, where people randomly intersect easily at corners, at cafés, in local shops, people can build a social network quicker and easier. Besides "

― Shane O'Mara , In Praise of Walking: A New Scientific Exploration