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Back in December of 2010, the U.S. Senate, followed shortly thereafter by the House of Representatives, voted to approve the Pedestrian Safety Enhancement Act of 2010. This required hybrids and plug-in vehicles to emit an audible warning. With noise-adding systems mandatory in the U.S., numerous automotive suppliers, including Delphi, have swung into action by developing so-called "sounders" for hybrid and electric vehicles.