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"With the many successes of hybrid and electric cars, including a significant reduction in air pollution, it seems we&amp;#039;ve isolated the do-gooder vehicle&amp;#039;s one downfall: Where&amp;#039;s all the noise? It&amp;#039;s true: According to the NYTimes.com, safety experts\u2014backed by Congress and other federal regulators\u2014are concerned about the car motor&amp;#039;s lack of vroom posing a threat to pedestrians, children and the seeing-impaired who can&amp;#039;t hear them approach, and have called on automakers to supply the new breed of quiet cars with digitally-enhanced sounds. According to a University of California lab testing, &amp;quot;subjects listening in a lab could detect a gas-powered car&amp;#039;s approach when it was 28 feet away, but could not hear the arrival of a hybrid operating in silent battery mode until it was only seven feet away.&amp;quot; Car companies have taken their noise-making research to Hollywood special-effects wizards, the film industry along with the National Highway Traffic Safety Administration and the National Federation of the Blind. Some, like BMW, are considering the possibility of creating their own &amp;quot;car tones,&amp;quot; while current car owners have come up with their own warning measures, like blaring the radio. Understandably, there are some automakers who believe they&amp;#039;ve worked hard to cut down car noise pollution, and believe cars should stay quiet. Perhaps a compromise: a manually operated noisemaker.  If you could create your own signature car engine noise, what would it sound like? Tell us in the comments. Photo cred: iStock "^^<http://www.w3.org/2001/XMLSchema#string>
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