NHTSA looking to implement new noise enhancement rules for electric vehicles

(PhysOrg.com) -- The U.S. National Highway Traffic Safety Administration (NHTSA) announced on July 7, that it plans to implement new regulations requiring electric vehicles to emit some as yet undesignated "noise" to warn pedestrians of its approach. This move comes on the heels of passage, by Congress, of the Pedestrian Safety Enhancement Act of 2010, which requires the NHTSA to take action to protect pedestrians from the nearly noiseless electric (and hybrid) vehicles that lawmakers believe pose a hazard to unsuspecting people crossing roads, especially those with hearing impairments.

The legislation has come about as a result of two studies that indicated that might be at increased risk of being run over by . The first, conducted in 2008 by Lawrence Rosenblum, a University of California perceptual psychologist, showed that subjects wearing blindfolds were able to hear a Honda Accord with a gas engine approaching from as far away as 36 feet, but were only able to hear a (hybrid) when it drew as near as 11 feet.

In the other study, done by the NHTSA itself, research indicated that there was a higher percentage rate for electric vehicles running into pedestrians, than gas powered models.

And while some may debate the accuracy of the research (the NHTSA study used data from just 12 states and only for one year) or the degree to which electric vehicles actually pose a risk, the bottom line, is that new regulations are very likely going to be implemented, a draft standard will be issued in 2012, with the new rules going into effect in 2015.

Thus, the issue now is just what sort of “noise” will the car manufacturers be required to add. Some, such as the Nissan Leaf, already make a sort of whoosh sound, and Ford is opting for a crowd sourced option that will hopefully come up with a sound that the majority of electric vehicle owners won’t hate. All this might be moot however if the NHTSA picks a noise on its own. Also an issue is whether such cars would be required to make the noise all the time, or just during slow driving when it more likely matters. They could also decide to add different noises for different activities, such as when a vehicle is moving in reverse or turning, a likely possibility since the legislation spurring them to action in the first place also applies to light and low-speed vehicles, motorcycles, buses, and heavy-duty trucks.

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Citation: NHTSA looking to implement new noise enhancement rules for electric vehicles (2011, July 13) retrieved 20 August 2019 from https://phys.org/news/2011-07-nhtsa-noise-electric-vehicles.html
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Jul 13, 2011
Well, Harley already has the "potato - potato" sound .............

Jul 13, 2011
Waste of time. We might as well add TSA checkpoints as well.

Design roads so it is physically impossible to hit pedestrians and let computers navigate for cars. Or more cost effective since money is our sole mission in life, tell the pedestrian to walk away from the roads.

Jul 13, 2011
Maybe they will legislate the decibel level of the sound, so that car manufacturers can provide their own unique sounds. And then users could download their own "road tunes" sound for their vehicle.

Jul 13, 2011
Or maybe people can listen to what their mother told them and look both ways before stepping out onto a road.

Jul 13, 2011
The other day I was listening as my neighbor was teaching his son to " Look both ways ", I noticed he also was adamant about listening for vehicles too.

I could see the merit in this, but there could be a better solution.

Jul 15, 2011
Following the warped logic of the NHTSA they will have to require the removal of the mufflers on most of the new gas cars that are hard to hear at idle because someone could get run into if the driver is not floor boarding it and the electric cars need 500 watt speakers playing the sound of a top feul dragster reving according to the drivers throttle position. Problem solved.

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