The Sounds - and Dangers - of Silence
Wednesday, October 14, 2009 2:26 PM
Sometimes too much of a good thing can be dangerous.
Consider the automobile. Decades after Henry Ford designed the Model T, car manufacturers are building hybrid-electric cars that are so quiet, they are considered dangerous to pedestrians.
The New York Times reports today that hybrid and plug-in electric cars have become so quiet that they are too quiet.
The Pedestrian Safety Enhancement Act of 2009 would mandate a federal safety standard to protect walkers from super quiet vehicles.
A Toyota spokesperson told the Times the company realizes quiet hybrids could be a risk to sight-impaired pedestrians.
The Fisker Karma, a luxury plug-in hybrid scheduled to go on the market next year, will pump out audio from the rear bumpers. The sound is a mix of a starship and a Formula One car, according to the founder.
An official at BMW's Mini Cooper says one option would be giving drivers a choice of noises, the way cell phones offer various ring tones.
A study by the University of California, Riverside and sponsored by the National Federation of the Blind, showed that people in a lab could hear a conventional gas-powered car at 28 feet away - but could only hear a hybrid when it was seven feet away.
Should cars that glide quietly stay quiet, or do they need to emit warning noises? Read more here.
Our hybrid-electric buses are certainly quieter than our diesel-powered buses - but so far, no one is complaining they're too quiet. In an age when we're assaulted with traffic and construction noises, METRO's hybrids are a welcome addition - and subtraction in decibels - to the road.