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Link: http://www.engadget.com/2008/04/10/proposed-bill-aims-to-set-minimum-auto-sound-levels/
One of the nicer features about the newer electric hybrids is that they're quiet. So, in the name of safety, what do you think the next step should be?
Yup. Make the cars generate digitized engine noises over external loudspeakers so pedestrians can hear them. The sole argument in favour of this that's vaguely convincing is that of trying to let blind people know the car is nearby. And even that's pretty weak.