Just kidding. No, the Prius is not an evil computer from a Harlan Ellison novel. Instead, the real Prius now can make an optional electronic humming noise. Due to complains that the whisper quiet Prius in not noticeable and a possible hazard, the concerns for safety has given rise to this audible device.
I think it is a welcome addition. I will admit that I didn't notice a Prius once, and it was very quiet where I was crossing a street. However, the sound they chose to use makes it sound like the Prius is from the future. Learn more about this product, and watch the video here.
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