Outdated zoning regulations that compartmentalized land uses has encouraged sprawl. Public transit hasn't kept pace with development meaning many residents need a car to get around.  This is especially true for those of us who live in the suburbs.  My own inner suburban neighbourhood has a walkscore of 68 out of 100 which means I live in a "somewhat walkable" (translation - not that great) location in terms of convenient proximity to businesses, amenities and recreation.