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Re:Why haven't China's cities learned from America's mistakes? by claudius on Thursday August 28, 2014 @05:17AM (#8236488)
I think the key here would be to limit both – no buildings higher than ~6 stories (~30m) and a limit on urban boundaries, either enforced by land planning or economics.

Standard mansion blocks of six stories still have a much higher population density than suburban sprawling single-family homes while avoiding some/all of the issues with too high a population density – two-lane roads are usually quite sufficient and the sun does reach the ground from time to time.

See e.g. Berlin and Munich for (IMHO) decent examples of this.

Re:Why haven't China's cities learned from America's mistakes? by Herbert2 on Thursday August 28, 2014 @07:58AM (#8236787)
I'm all for less sprawl but artificial limits like the ones you're describe would IMO only needlessly accelerate gentrification. For instance, it's very difficult to get a spot at a daycare in Munich, not because there isn't space in the system but because the city can't afford to hire staff that can afford to live in Munich.