Arrol Gellner is an architect and syndicated columnist writing about design and planning. He notes that our planning and design is now based on the needs of the automobile, but that things can (and probably will) change..
"...Cars in their present form are no more a permanent fixture of our built environment than were the oxcart, the chariot, or the horse and buggy. We happen to live in the historical apogee of the internal-combustion automobile, but even the smallest degree of historical perspective makes plain that it's merely a temporary visitor -- and an increasingly troublesome one -- on planet Earth." ::Boston.com
More on planning and cars in TreeHugger:
Eco-Towns: Three Models of Green Urban Planning
How to Build a Green, Car-free Community: Vauban