Earlier quoted context omitted.
Nice philosophising, but it's vehicles. Primarily cars, but not only. By far the most common and the loudest source of noise, especially in cities, are vehicles, again, primarily cars. During the pandemic it became painfully obvious how loud cars are. Every time a city closes down streets, the same thing can be noticed. It can be shocking to some, but even the most crowded places on the planet are quite silent when v…
> By far the most common and the loudest source of noise, especially in cities, are vehicles, again, primarily cars. Hugely depends on the city. Where I live it's the cargo trains and airliners. Congestion is too severe for anyone to make significant noise, unless they have modified/dysfunctional exhausts or particularly large engines.
Cargo trains, I imagine it's similar.
> Congestion is too severe for anyone to make significant noise, unless they have modified/dysfunctional exhausts or particularly large engines.
Large numbers of cars idling make enough noise to basically rival human conversations at regular speech levels. Anything above that (usually anything higher than 30kmph) makes it even worse. I'm not sure it's exponential, but I think it increases supra-linearly afterwards.