NHTSA Proposes Rules for Automakers to Add Sound to Hybrids, EVs

Vehicle sounds said to improve pedestrian safety

To meet the requirements, automakers would need to add speakers that are audible from the street.
By: Gabe Nelson, Automotive News on 1/07/2013

Automakers would need to make hybrids and electric vehicles emit sound under rules that the National Highway Traffic Safety Administration proposed on Monday.

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http://www.accessibilitynewsinternational.com/nhtsa-proposes-rules-for-automakers-to-add-sound-to-hybrids-evs/