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This has been talked about for years, as the electric cars started to appear. About 10 years ago there was speculation in the magazines about cars being customizable and maybe sounding like crickets or some kind of natural world sound. But some years back NHTSA decided that only a narrow range of sounds that the population can learn to identify as a "car" will be allowed. I'm kind of surprised that Tesla went this long without doing the pedestrian alert.
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