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Comment by b112 | Hacker News Reader

For thousands of years, high-density living meant a 3 or 4 story apartment building. Certainly not sky-scrapers, they weren't even possible to build until the last century or two.

What you state as "urban sprawl" would be "mostly normal" living density for a city like Rome. When I walk the streets of larger cities, its not like the downtown core has acres of land per house, or even a 1/4 acre.

Now of course, there are some differences over time. But my point is that it's not as if the car has caused urban sprawl, in fact, downtown cities are far more dense than 500 years ago. Or 2000, or whatever. One 40 story apartment building, which is common not even just in downtown cores, is a lot more dense than anything 1000 years ago, land use would be 10x or 20x or even 40x.

I know there's this fad to pretend the car caused every problem ever, but it's just not true.

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You are mixing up a lot of different factors.

3-4 story apartment buildings gives a net residential density of 30-100 units per acre. Typical 20th century urban development is 3-10 units per acre, with suburban "urban sprawl" at the low end of that. See [1] for examples.

Yes towers exist now, and downtown areas have much more intensity and square footage. But outside of NYC (861 of the top 1000 densest census tracts) and a very short list of other parts of other US cities[2], residential density is much lower almost everywhere than it was in 1950, including in cities. Units per acre and especially people per unit have steadily and dramatically dropped. The drop in NYC population density is dramatic even as built square footage has increased[3].

But for every 40 story tower out there, there are hundreds of square miles of car-centric suburban development.

[1] https://mrsc.org/stay-informed/mrsc-insight/april-2017/visua... [2] https://www.youtube.com/watch?v=zFB5YooSo5M&t=936s [3] https://urbanomnibus.net/2014/10/the-rise-and-fall-of-manhat...

Modern cities have a lot of buildings that are sparsely populated. 500 years ago, major Italian cities had ~15k people / square km, which is similar to Brooklyn. Paris had 35k to 50k people / square km, making it more densely populated than Manhattan.

2000 years ago, Rome had similar population density to Paris 500 years ago.

Historically, urban people wanted to live inside city walls, if possible. When the population grew, most of the growth turned into higher density inside the walls. There was always some urban sprawl outside the walls, but that was mostly poor people and those who didn't have the right to live in the city proper. Major cities occasionally built a new set of walls surrounding a wider area, but that didn't happen every century.

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