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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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Kids today may be more familiar with the sound of a rushing highway than a rushing river.

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But imagine that the internal combustion engine could be set aside and we could design the soundscape of our future.

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What aural environment would you choose for traffic?

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For the National Highway Traffic Safety Administration, the answer is that new cars should sound like old cars.

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Hybrid and electric vehicles can be so quiet that people outside the vehicle can't hear them.

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So these too-quiet cars will be required to sound something like this

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The Obama administration wants a million electric vehicles on the road by 2015.

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Slow sales of cars like the Chevy Volt and Tesla Model S may keep that number from being reached.

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But there are still hundreds of thousands of EVs and hybrids on the road today.

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It's hoped that the new rule will help prevent thousands of pedestrian and cyclist deaths.

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But the rule also hews to a possibly outdated tradition, like people who set their cellphone ringtone to sound like an old rotary phone.

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And it's wasting a chance to reimagine what our cars, roads and even cities could sound like.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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