I’d be a bit more skeptical about this if I hadn’t nearly been run over by a Prius a couple of times walking up the hill to work. I guess I’m more reliant on audio cues for crossing the road that I’d like to think I am. See Lotus Makes Hybrids Sound Like Real Cars.
It’s be interesting to see it we ever end up with minimum noise requirements for cars to go with the current maximum noise restrictions.
Also, if I had one of these systems I’d want my car to sound like a Tie Fighter 🙂