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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