It's counterintuitive to want too make a Prius sound louder since the whole idea of this "green" car is to reduce pollution. That includes sound pollution. But Priuses can be dangerous if you can't hear them coming as you cross the street. It's especially dangerous for the blind.
Prius Gets Sound Option to Protect Pedestrians(AP) Toyota's Prius hybrid is becoming a little less quiet with a new electronic humming device that is the automaker's answer to complaints that pedestrians can't hear the top-selling car approaching.
The 12,600 yen ($148) speaker system that goes under the hood of the third-generation Prius sets off a whirring sound designed to be about the same noise level as a regular car engine so that it isn't annoying, Toyota Motor Corp. said Tuesday.
Read more on the Toyota Prius noise option.

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