Is there any legislation proposed to ensure cars make at least a certain amount of noise while driving, for safety reasons? The new Prius will have a noise generated so that blind people/distracted people will be aware of the car coming around the corner, is there any plans to require this sort of thing by law? Seems to me that once these types of almost silent cars start to become popular we'll see an increase in pedestrian injuries.

This may be a little off-topic, and it's not a dig at the Tesla which looks like a great car, I was just struck by how silent it was (I haven't seen a fully electric car in person here in Australia yet)