All EVs Operating Under 18 MPH To Have Audible Warning

JAN 8 2013 BY JAY COLE 20

What's That? I Can't Hear You Over All This Racket!

Legislating the sound an EV makes is a proposition that has been a long time coming.  Some would say too long; others, not long enough.

Whatever your opinion, the fact is that electric vehicles at low speeds operate almost completely silently; and without some form of audible warning, EVs could potentially be more harmful to those around them if  they go unseen and unheard.

Nissan Removed The Ability To Disable The Pedestrian Warning Sound in 2012 In Anticpation Of This Ruling (2011 LEAF shown above)

The NHSTA has recommended, after almost 3 years of thinking about it (ever since 2010, with the Pedestrian Safety Act), that all electric vehicles, and similarly operating hybrids, travelling under 18 miles per hour need an audible alert when in operation.  This new sound has to “enable pedestrians to discern vehicle presence, direction, location and operation.”

In truth, this comes as no surprise to any of the major plug-in automakers, as most EVs already come with a driver enabled system to warm pedestrians of their proximity.  Other auto makers, like Nissan with the LEAF, have already implemented the mandatory change. (Nissan removed the ability to disable to pedestrian alert on the LEAF between model year 2011 and 2012)

The NHSTA estimates that 2,800 fewer pedestrians and bicyclists injuries would occur over the life of each model-year vehicle effected by this change.

“Safety is our highest priority, and this proposal will help keep everyone using our nation’s streets and roadways safe, whether they are motorists, bicyclists or pedestrians, and especially the blind and visually impaired,” said U.S. Transportation Secretary Ray LaHood.

The NHSTA has logged the changes with the Federal Register and will address any problems that are brought over a 60-day public comment period.

  • What you need to know about the sound:  While each automaker is free to emit their own individual, unique sound at the appropriate level, it requires that each model they produce to emit the same sound
  • Cost: The NHSTA estimates that the speaker system will add $30 cost to each vehicle
  • When:  NHTSA has until next July 4th to set the regulation, then another six months to publish the final rule (Jan 2014), and upwards of another full model year to start start to implement it ( starting Sept 2015).  The legislation will take 3 years in total to be phased in.  (But we expect most automakers to proactively comply with MY 2014 offerings this fall)


U.S. Department of Transportation Proposes New Minimum Sound Requirements for Hybrid and Electric Vehicles Monday, January 7, 2013

Proposal Would Allow All Pedestrians to Detect Vehicles that Do Not Make Sound

WASHINGTON – As required by the bipartisan Pedestrian Safety Enhancement Act of 2010 (PSEA), the U.S. Department of Transportation’s National Highway Traffic Safety Administration (NHTSA) is proposing that hybrid and electric vehicles meet minimum sound standards in order to help make all pedestrians more aware of the approaching vehicles.

“Safety is our highest priority, and this proposal will help keep everyone using our nation’s streets and roadways safe, whether they are motorists, bicyclists or pedestrians, and especially the blind and visually impaired,” said U.S. Transportation Secretary Ray LaHood.

Electric and hybrid vehicles do not rely on traditional gas or diesel-powered engines at low speeds, making them much quieter and their approach difficult to detect. The proposed standard, Federal Motor Vehicle Safety Standard No. 141, would fulfill Congress’ mandate in the Pedestrian Safety Enhancement Act that hybrid and electric vehicles meet minimum sound requirements so that pedestrians are able to detect the presence, direction and location of these vehicles when they are operating at low speeds.

“Our proposal would allow manufacturers the flexibility to design different sounds for different makes and models while still providing an opportunity for pedestrians, bicyclists and the visually impaired to detect and recognize a vehicle and make a decision about whether it is safe to cross the street,” said NHTSA Administrator David Strickland.

The sounds would need to be detectable under a wide range of street noises and other ambient background sounds when the vehicle is traveling under 18 miles per hour. At 18 miles per hour and above, vehicles make sufficient noise to allow pedestrians and bicyclists to detect them without added sound. Each automaker would have a significant range of choices about the sounds it chooses for its vehicles, but the characteristics of those sounds would need to meet certain minimum requirements. In addition, each vehicle of the same make and model would need to emit the same sound or set of sounds.

NHTSA estimates that if this proposal were implemented there would be 2,800 fewer pedestrian and pedalcyclist injuries over the life of each model year of hybrid cars, trucks and vans and low speed vehicles, as compared to vehicles without sound.

NHTSA will send the proposal to the Federal Register today. Upon publication, the public will have 60 days to submit comments on this NHTSA action.

Read the extremely lengthy, 248 page PDF proposal here
(no wonder it took them 3 years to get this drafted)

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20 Comments on "All EVs Operating Under 18 MPH To Have Audible Warning"

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Fearless prediction: 30 years from now, EVs with the ability to legally operate without sound will be collectible

does that mean your Leaf and my Volt?

I don’t have that kind of patience George, (= I’m one LEAF down, one to go now…and I have a feeling it will last only as long as it takes Infiniti to put out the all-electric LE late next year, then I’ll be chiming along with everyone else on the road.

I do have to say, the fact it can operate silently does put a slight pencil-checkmark in the ‘do I keep it and replace the other’ EV box…but I doubt it is enough to save it.

It will probably be made retroactive like the center-mounted brake light.

Normally I am a liberal. but in this case I think this is dumb over-regulation

Now imagine being targeted by equally dumb over-regulation every single day. That’s what life is like for us libertarian conservatives. 😉

I remember a fire storm over this law when it was enacted. But it has turned out to be a storm in a teacup. Infact I’ve not even thought about this warning sound for over a year, until I read the title.

I think about it every day when I press the stupid button on my ’11 LEAF to turn it off.

I do leave/turn it on in some situations – but I really wish it would default to off and let you turn it on when needed instead.

Perhaps they can also legislate not texting while you are walking thru a parking lot… Whatever… ;-/

Not texting/talking while driving is already legislated but I still see douch-bags staring at their phone while driving or pressing their phone against their ear while driving daily.

The following line from the article makes no sense:

“While each automaker is free to emit their own individual, unique sound at the appropriate level, it requires that each model they produce to emit the same sound”

So how can each manufacturer choose their own sound, but still be the same as everyone else?

I guess that isn’t worded as clearly as it could have been.

Each automaker can set its own sounds for the cars they produce (provided they are inside the NHSTA’s rather lengthy guidelines), but they can’t produce several different sounds inside one model lineup.

ie) GM can’t make a Volt that lets the driver choose from 15 different selectable sounds. All 2016 Volts have to have the same audible warning sound, but a 2016 Spark EV can sound different than its sister Volt.

I saw a highly directional speaker system demonstration 10 years ago that would work nicely in an EV application. When you stood directly in front of the speakers, the sound was very loud. With every degree you moved off center, the sound would drop significantly. By the time you were 45 degrees or so to the side, it was nearly silent. With such a system you could warn the pedestrians in front of you without creating excessive “noise pollution” in all directions.

What about when an EV is backing up. Does the sound change?

Let’s start a petition for GM or Nissan to implement “Staying Alive” by the Bee Gees as their official EV sound. How cool would that be?

The sound should be from a whoopie cushion.

My ears are old and even older from listening to Led Zeppelin to King Crimson, but still I hear the high pitch of my EVs electric motor, the whine from the regenerative brakes, the clicking and blowing from the heat and AC. Honestly I have heard ICEs that were equally as quite under the “right” circumstances, therefore I think the law should be passed to add the noise to ALL motor vehicles! I mean after all there argument is about safety right???????

Please make the Volt 2.0 with the Blade Runner sound…


I’d like the bubbly car sound from the Jetson’s cartoon. That would be cool.

I still want the sound the Flubber car made while flying.