I wonder what kind of noises will be mandated or if it will be up to the car companies ... and if they'll be customization (like cell phone ring tones). I think the Jaws theme would be kinda awesome (especially if the intensity is matched to your speed).
Or this https://www.youtube.com/watch?v=V9eubFCvPsM
Of course in the ghetto they've had these low-speed sound things for years.

