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90% of the things they named weren’t cars but in practice if you actually compare cities with tons of cars vs ones with few you’ll find that removing cars removes 90% of the noise.
If a city was too quiet I’d go from being annoyed at all the noise to being paranoid that I’ll be the one being too loud.
And that’s why people do less yelling when there aren’t cars around. That’s why removing cars makes the other stuff quieter.