The US doesn't have the population density of Japan or Europe because of our zoning laws. The barriers to even try these kinds of developments in the US are ma

The US doesn't have the population density of Japan or Europe because of our zoning laws. The barriers to even try these kinds of developments in the US are massive. The barriers to build yet-another cul-de-sac subdivision of mcmansions that are proven to increase congestion, travel-time, stress, infrastructure cost, individual waste and municipal waste are non-existent. Zoning laws dictate density. We have sprawl because our laws engineered it and we were lucky enough to have the wealth and space to allow such frivolous waste to continue for so long.