It takes years of meticulous engineering and months of public hearings and approvals before a hillside can be bulldozed into a parking lot, or a highway lined with drive-ins and billboards. The result is so ubiquitous, and so familiar, that people assume that it must be the work of powerful economic forces. But what has directed the new urbanization up to now is not so much the invisible hand of the marketplace as the deadly grip of outmoded regulations.