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.

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