Cars aren't nearly as loud as sirens and garbage trucks. Whenever I stay in a dense city those tend to keep me up at night.
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Without cars, emergency vehicles could have their sirens at 10% of the volume. Garbage trucks and busses are slowly being replaced by electric versions which are much quieter.
> Cars aren't nearly as loud as sirens and garbage trucks
Guess what forces emergency vehicles to fire their sirens, or garbage trucks to linger.