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Late last year, Nissan unveiled its "Approaching Vehicle Sound for Pedestrians" (VSP), a technical name for the noise-adding system found on the automaker's Leaf electric vehicle. Introduction of a pedestrian warning system on near-silent vehicles like the Leaf has been the subject of much debate, but with the U.S. House and Senate passing a measure that requires hybrids and plug-in vehicles to emit an audible sound to warn pedestrians, these noise-making setups will soon become standard on all

After several years of hard work and collaboration with acoustic psychology experts, professional sound studios and advocates for the blind, Nissan has finally decided on the noise that its Leaf electric vehicle will make. And it's, well, it's kind of hard to explain. It sounds like something, but we are having a hard time putting our finger on it. USA Today described the sound as "a mix of a jet engine and the cartoon Jetsons' spacecraft," which we have decided – after many, many listens