Image: Toyota WHIIIRRRRRR Toyota will be offering its Japanese customers an optional (for now) $150 device that makes its 3rd generation Prius hybrid easier to hear at low speeds. They call it the “Approaching Vehicle Audible System”, and it basically makes whirring sounds that vary in pitch with the speed of the car up to 25 kph (check out the video below)…. Read the full story on TreeHugger
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Toyota to Offer External Speaker Option to Make Prius Noisier in Japan
