Technology
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Um... I thought the loudest component of modern cars are the tires, not the motor?
Maybe (as in I would have to check, not that I think it likely) at highway speeds. But in any low speed area, vehicles without gas engines can be sneaky.
My company was working on an electric bus and I saw a driver sneak up on an engineer with the aforementioned city bus. They actually, legally (in some places) need noise makers at low speeds to deal with this.
The crossover point is 30 km/h. At typical road speeds - not just highway speeds - tire noise dominates.
In my state it is the goddamn aftermarket exhausts and idiots setting their fuel/air mix to backfire.
If it was 60% of the noise that's a 40% reduction in noise