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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.

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Hybrid cars are good for the environment.

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But scientists say that they might be bad for pedestrians.

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Because hybrids are so quiet, it can be hard for walkers to hear them until it's too late.

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Listen to this.

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(quiet car sound)

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That's a Toyota Prius moving at five miles an hour.

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If you didn't hear anything, well, that's what worries scientists at the University of California, Riverside.

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They recorded the sounds made by an approaching hybrid vehicle and by a car with a standard, internal combustion engine.

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They then asked listeners wearing headphones to determine whether the car was coming from the left or the right.

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Turns out people could hear the standard vehicle from about 36 feet away.

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But the hybrid was able to sneak up to just 11 feet away before listeners knew where it was coming from.

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And when the scientists added some background noise, people couldn't pinpoint the direction of the Prius until it had already passed them by,

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results they'll be presenting at the May meeting of the Acoustical Society of America in Portland, Oregon.

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The solution, they say, is to require a "minimum sound" for all late model cars.

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No annoying beeps or alarms.

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Just something to supply that new-car sound.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.

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