Those new hybrid cars are proving to be just a little too "green" and not so environmentally friendly. They are too quiet. So quiet are they that pedestrians don’t hear them coming. So quiet that automakers expecting pedestrian complaints, if not broken bones, are  offering an under-hood speaker system that emits a whirring sound, similar to that of a running gasoline engine. On sale in Japan later this month for $148 plus the cost of installation Toyota has yet to decide on if and when they will sell them in the United States. All of this simply means that when crossing the street pedestrians need to have their heads on a continuously moving swivel.

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http://www2.toyota.co.jp/en/news/10/08/0824.html