Mass transit doesn't need "huge urban centers" and indeed can and does serve cities of all sizes. What it requires, though, is a minimum density. You can't se

Mass transit doesn't need "huge urban centers" and indeed can and does serve cities of all sizes. What it requires, though, is a minimum density. You can't serve a small, sprawling city. You can easily serve small, compact cities. Compare, for example, the transit effectiveness between Zurich and Tulsa, cities of comparable population.