Possibly not, says the National Federation For the Blind. According to the NYT the group is
disappointed that the [Nissan Leaf's] driver is permitted to turn off the sound because it in effect, allows drivers to deactivate this important safety feature and thereby endanger pedestrians, especially those who are blind.
Interestingly, Tesla’s IPO presentation opens with a customer describing the contrast between Corvettes “making all that noise” and Teslas which allow the driver to “hear the birds and the ocean.” With the Motor Vehicle Safety Act likely to mandate NHTSA rules on EV safety noises, expect that marketing angle to go the way of the PeaPod…