> we have simply run out of space that can be reasonably traversed by car I don't think it's that simple. There's a lot more housing that could be added with m

> we have simply run out of space that can be reasonably traversed by car I don't think it's that simple. There's a lot more housing that could be added with more density, and less transport needed if mixed-use zoning were more common. > flying cars, high speed trains everywhere You can get great cities with normal speed trains. Trains can carry far more passengers, for the same footprint, than a highway. See https://en.wikipedia.org/wiki/Route_capacity https://en.wikipedia.org/wiki/Route_capacity > In North America, the car made suburbanization possible In North America, suburbanization started with streetcars, running on rails. The car changed how we built, yes, but so did Federal Housing Administration, whose standards promoted single-family homes with on-street parking and made it hard to get loans ("red-lining") for the types of housing which made streetcar suburbs economically viable. https://en.wikipedia.org/wiki/Streetcar_suburb#Decline https://en.wikipedia.org/wiki/Streetcar_suburb#Decline