I guess it depends upon your perspective. This is my block:duphuk you mean it hardly feels cramped? LOL
I think the average population density in a US city is around 4k /sqm ? (I could be off I didn't check) I know that my city is around 4500 /sqm.
20k is nuts IMO
Compare to Manhattan:
Manhattan is a bit too dense for my tastes to live there but I love visiting.
I've never said otherwise but other places mostly use scooters or e-bikes or similar vehicles, not massive SUVs and pickups which just have the driver in them. Use vehicles that fit the location. SUVs and pickups are farm or work vehicles, not urban transportation (unless you have a business which needs them). Kei cars are great urban vehicles if you need something with more than two wheels. However I would like to see cars and trucks GPS governed to the speed limit on local surface streets. High speeds are incompatible with safety on urban streets. You want to drive fast go on a highway.No. Personal 'motorized' go fast or go slow vehicles (doesn't have to be a car) are never going away. We've always had personal transportation along with mass transit once that got sorted.
Civilization is all about compromises. Most of the compromises needed to live in a big city don't bother me. I do hate traffic signals but that's not inherent to cities. We can decrease vehicle use enough in cities and/or use roundabouts so signals aren't needed.Build a city from the bottom up, from scratch to hold your 20k density. No cars allowed. Build straight down, straight up. Build it in an imaginary bubble with all of the latest green tech. Make modular for easy of maintenance and any upgrading.
Have ALL of it designed by engineers that are/would actually live in said city to avoid any unrealistic 'dreamers' creating a thing that can't actually be lived in.
(what was that bio-dome thing in Arizona that failed?) Lot's of stuff got learned and some things fixed. But it wasn't actually self-sustainable.
You're gonna have to make concessions. There will be compromises needed. Not everyone wants, or even can live in a 20k-per density city. So they live just outside of it and commute. Mass transit is fine there also, but the cars/trucks/motor bikes remain.
You know what types of noise both people the most? Generally intermittent, very loud noises. Airliners flying overhead really annoys me. That's a big negative but airports really shouldn't be located anywhere near cities. Japan has the right idea building an airport on a man-made island. Motor vehicle engines are annoying also. Horns honking are extremely annoying. There are solutions to both. Electric vehicles and reducing congestion so people don't honk constantly.We aren't talking long term sensory deprivation. No artificial environments. Ppl are different and context matters.
I just read a study that said that noise is a larger issue with our health. That the constant (even relatively low 50db) is being cited as a (contributing) source of depression, anxiety and physical ailments.
The indoor environment people spend the most time in matters more. Since I installed more attic insulation I don't even hear planes flying unless I open the windows. It's eerily quiet inside my house despite it being in a fairly dense area.
The kind of noise matters. Random chatter from people and other similar noises are probably healthy. Remember we originated in jungles. Jungles have all sorts of these types of noises. Loud, mechanical noises on the other hand definitely affect health. For that reason some are trying to get the local airports closed eventually. Maybe we'll do the man-made island thing like Japan.We know that each person likes what they like ...for better or worse.
But average humans don't prefer noise. They do prefer being around or at the very least interacting with other humans. This becomes an issue for many.
Everyone can have a quiet personal space where they live, including in large cities. I'm not sure I like living alone though. Still getting used to it 2 years and 3 months after my mother passed.I like interaction with others. I like being around others. (We just had an old friend from high school come out to visit for a week - it was great hanging with them and they will be missed)
I also like my personal space. I like quiet when I want it and I like noise when I want to hear it. (Music preferably but I'll also take a V8 engine at my foot)