To put it succinctly: cars are useful, but also dangerous, and require huge amounts of land to run and store in any quantity. After discovering that trying to r

To put it succinctly: cars are useful, but also dangerous, and require huge amounts of land to run and store in any quantity. After discovering that trying to rebuild cities with room to run and store large amounts of cars, we've discovered many negative side effects, and so have stopped trying to build cities in such a fashion.