A step in the right direction right here:
One thing concerns me about electric cars, all the reports go on about how quiet they are yet no one seems to mention the dangers posed to the deaf, the blind and daydreaming pedestrians.
Will electric cars have to play some sort of sound through PA speakers to warn people of their approach? At present you can hear the engine and maybe the tyres, but with electric motors being very quiet and the high efficiency tyres used on electric cars there could be some carnage.
Instead of annoying poppy ringtones for your phone, you will get annoying poppy 'ringtones' for your car :)