I'm not familiar with his highway plan, but unless he figured out a way to transcend limitations of spacetime, providing transportation to an insane land use of

I'm not familiar with his highway plan, but unless he figured out a way to transcend limitations of spacetime, providing transportation to an insane land use of one acre per person would be intractable. The common wisdom is that, due to latent demand, you can't really build your way out of congestion. That would be extra problematic under the land use you mention, as you'd be forcing everyone to drive everywhere (mass transit and walking are difficult when populations are diffuse and distances are vast). So, yeah, this strikes me as being a utopian vision by a talented architect dabbling in something outside his expertise.