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Doesn't the graph on that site show that electric trucks would be a huge win for lower noise in the city? I would be interested in the standard deviations of these line plots, because I would guess that the engine noise varies much more depending on the acceleration of the truck. I am not that much annoyed by a truck driving with constant speed, but much more annoyed by a truck which is heavily accelerating. And maybe 9 out of 10 trucks passing by are just driving with constant speed but the 10th will be the one which is annoying because it is accelerating.

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