Pedestrian Alert Noises Coming To Hybrid And Electric Cars, Needed Or Not

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A new study concludes that Prius repairs cost 8.4 percent more than repairs on non-hybrid economy cars.

A new study concludes that Prius repairs cost 8.4 percent more than repairs on non-hybrid economy cars.

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If you like the idea of hybrid or electric cars that whir silently down the road without the noise of an engine exploding gasoline thousands of times each minute, you'd better act fast.

The U.S. government is moving inexorably toward a rule requiring all hybrid and electric cars to make noise whenever their engine isn't running.

The National Highway Traffic Safety Administration (NHTSA) published a notice of intent and request for comments on its website yesterday, as it moves to implement last year's Pedestrian Safety Enhancement Act.

Targeting electric motors, not noise

That law requires the NHTSA to "establish a standard requiring electric and hybrid vehicles to be equipped with a pedestrian alert sound system that would activate in certain vehicle operating conditions to aid visually-impaired and other pedestrians in detecting the presence, direction, location, and operation of those vehicles."

2011 Nissan Leaf

2011 Nissan Leaf

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The bill doesn't target a car's noise level, however, or what engineers would call a "performance-based standard." So the quietest, most hushed Rolls-Royce gets off scot-free and won't be required to make noise.

Instead, it targets only vehicles with specific propulsion systems: those that can operate on electric power, whether for a mile or less (e.g. the 2011 Toyota Prius) or for up to 100 miles or more (battery electric vehicles like the 2011 Nissan Leaf).

The NHTSA issued two reports on pedestrians and vehicle noise levels. The first, in October 2009, seemed to show higher accident rates among hybrid vehicles than non-hybrid models of the same car.

The second, in April 2010, covered vehicle noise levels among different types of vehicles and how people nearby perceived them, without looking at accident rates.

NHTSA highlights own flaws

The difficulty is that there's simply not enough data on actual pedestrian injuries and deaths attributable to quieter cars. Part of that reflects a lack of categories to reflect such a problem, and the low incidence of pedestrian injuries in general.

Pedestrians: Small children walking across an intersection

Pedestrians: Small children walking across an intersection

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The 2009 NHTSA report highlighted its own weaknesses: It was based on data from only 12 states (the ones that record Vehicle Identification Numbers) and limited to injuries from 2000, when hybrids first entered the U.S. market. The result: a small, possibly non-representative sample set.

And electric-vehicle advocate Mark Larsen did his own analysis, using NHTSA Fatality Reporting System data, that concludes there is essentially no data showing higher fatalities or increased injuries to pedestrians since hybrids hit the market a decade ago.

Wheels of the law move forward

Nonetheless, under political pressure from the National Federation for the Blind, Congress enacted a bill and the NHTSA must now implement it.

We can only view with resigned amusement the fact that the usual critics of any and all government regulation of the auto industry are remarkably silent on this issue.

Rather than gathering solid data or leaving it to the automakers to decide how to solve the problem--pedestrian proximity sensors, anyone?--a badly-written Congressional bill has mandated a single solution to an ill-defined problem that may not exist.

Seeking silence? Buy soon

Meanwhile, if you want a quiet hybrid or electric car, buy one soon. The NHTSA must issue a draft standard by July 4, 2012, and a final rule two years after that. Then manufacturers have roughly three years to comply.

2011 Hyundai Sonata Hybrid

2011 Hyundai Sonata Hybrid

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Most 2011 hybrids that can run electrically--except the Hyundai Sonata Hybrid, which was delayed to add the noisemaker, and Kia Optima Hybrid--are still silent when running electrically, including those from Cadillac, Chevrolet, GMC, Nissan, Toyota, Porsche, and Volkswagen.

Among plug-in cars, the 2011 Chevy Volt has a driver-activated pedestrian alert function, but at the moment, it doesn't automatically make noise below any given speed. But sounds vary across different models from different carmakers.

U.S. models of the 2011 Nissan Leaf emit a kind of Star Wars whir below about 15 mph--except in the U.K., where the government required the noise to be deactivated so as not to disturb neighbors between 11 pm and 6 am.

You have been warned.

[NHTSA via Bloomberg]


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Comments (6)
  1. You know what this whole thing about EV's (and now hybrids, a decade after the fact?!) feels like to me?

    A FUD campaign by those who are worried about their effects in the market.

    Mercedes and Rolls Royce and Lexus, etc. have been making very quiet cars for a long time. In fact, it is a point of pride for several manufacturers that their cars are so quiet.

    But, now that we have EV's coming on the market, it suddenly becomes a problem? Were hybrids too quiet 10 years ago? C'mon...


  2. Well it will make the roar of traffic quieter as long as traffic isn't creeping at less than 15. But if I don't like the sound I might have it shut off. Dealerships will turn off your daytime running lights if you don't want them on, so I'm sure you could do the same with your sound generator. I'm no longer opposed to EVs generating noise, but I'd be pretty mad if I bought a car that sounded like a goofy space ship. I like the jet like sound of an electric motor, just amplify that.

  3. The most optimistic result will be hybrids becoming just as deadly as today's ordinary cars. The blind will still be struck down as before as the unintended consequence,"I'm making a noise, they will stop" occurs.

    What is worse, the NHTSA report DOT HS 811 204 used extremely small numbers, 19 turning and 7 backing incidents to make the inflated claims. Later, politicians like Sen. Kerry expanded the 'scope' to all hybrid maneuvers and claiming a 'double rate.' Congress has been snookered, again.

    Sad to say, it will take implementation to get Congress to fix the law. Once the noise makers go from 'theory' to annoying fact, the law can be changed.

  4. Ah, our brainless Fed regulators are at it again. In this instance they have failed to show a need for cars to emit noises, or how loud and what type, etc. They have also failed to demonstrate,if vehicle noise is required, that only electric cars need to have
    artificially generated noises - there are plenty of gas powered cars that simply cannot be heard - I know this from experience, and I have excellent hearing.
    Britain has already banned such noise producing apparatus for EVs under anti-noise regulations. Automaker lawyers will have an easy job suing the Feds over this one. The Feds are dumb to the point of embarrassment on this issue.

  5. Ramon: I'm curious. You're a frequent commenter on this site, which we appreciate. But your posts have been almost entirely negative. You seem to be angry about a lot of things relating to green cars, California, national and state government, and many other topics. What gives?

  6. How about people pay attention to the road and watch for all pedestrians. They have the right of way, not cars. It's that simple. Unfortunately, 99% of drivers in my area never yield to pedestrians at a cross walk. The answer is not more regulation. Police can ticket drivers that fail to yield to pedestrians while they wait to ticket drivers that make rolling stops at stop signs, or that fail to yield(and stop), for the other drivers right of way, at a merge clearly marked with a big yield sign. Change drivers bad habits by enforcing what is already California law.

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