Autopilot Emergency Braking Prevents Tesla Model S Collision – Video


Automatic Emergency Braking Prevents Tesla Model S From Colliding With Car In Front

Automatic Emergency Braking Prevents Tesla Model S From Colliding With Car In Front


This video shows what could’ve been a three car pile-up involving a Tesla Model S.

Instead, due to Tesla’s Auto Emergency Braking (AEB), part of the sensor suite that allows for Autopilot mode, the Tesla Model S avoids colliding with the vehicle in front.

Video description:

“Tesla has been in the news recently about their “Faulty Autopilot”. It’s not faulty. Here’s one piece of anecdotal evidence that explains why.”

The Model S didn’t completely escape the incident unharmed though. As the rear-facing camera shows, while the Model S stopped in time to avoid accident, the vehicle behind the S did not. The Model S got rear-ended at low speed.

Auto Emergency Braking is a feature found on lots of newer, high-end cars today, but it’s made possible in part by the hardware and software that’s there for Autopilot mode in Tesla vehicles.

Categories: Crashed EVs, Tesla, Videos

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52 Comments on "Autopilot Emergency Braking Prevents Tesla Model S Collision – Video"

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Here we go again.

That’s AEB. It’s a great technology and available on many vehicles from $15k on up.

Consumer Reports didn’t call on Tesla to disable Automated Emergency Braking.

Agreed… This is little more than automatic emergency braking. Many cars have this feature available and they cost a whole lot less than a Tesla.

Kudos to Breezy for the clarification!


The title of the thread should be updated

Well I guess the following car did not have that technology, AEB. So we could say not having it caused the accident, though ultimately people are responsible for their vehicles when they are behind the wheel.

You haven’t noticed the pattern yet? As practiced by Elon Musk himself?

1) Whenever AEB fails and is discussed as part of an accident, it is a “distinct and separate” feature that has nothing to do with autopilot.

2) Whenever AEB worked and managed to do its job, it is part of the autopilot and should be described as simply “autopilot”.

The impression given by this dude is that AEB wouldn’t be active unless autopilot was engaged. He repeatedly claims he would have crashed if he didn’t have autopilot.

Well, if so he was driving much too close to the car ahead. You’re supposed to be able to stop.

Terawatt – Actually the opposite is true. If there is a failure in AEB (like a the side of a truck trailer getting confused with an overhead road sign or an overhead bridge, all the crazies claim that it is the fault of Autopilot.

Including Consumer Reports, who published their article calling for Tesla to disable autopilot largely because of that same fatality.

No, you are talking about Traffic Aware Cruise Control, which as the name expressly states is to be aware of traffic. If Traffic Aware Cruise Control isn’t capable of being aware of traffic that’s a bit of a problem, especially given what Tesla named it. AEB is on regardless of whether or not TACC and Autosteer is on and you don’t have to pay extra for it, like you do with TACC/Autosteer.

The problem isn’t cruise control or braking or “autopilot”. Mobileye stated very clearly that their system can’t detect cross traffic now, and other automaker braking system would not work 100% of the time too, not so much difference in this aspect. Maybe Volvo automatic braking would work better sometimes, but still not 100%.

The problem is deceptive and reckless Tesla marketing of traffic aware cruise control as some kind of autonomous driving, unique and special to their car. Well you need to justify ~$100k price tag somehow. All the videos reposted by Musk and Tesla salesmen teach you that it is ok to drive with hands off the wheel assuming a car can drive on it’s own. It is the cause of all “autopilot” related incidents and the recent death. I didn’t heard of other brand that would allow you drive without hands for long or market their traffic aware cruise control/autosteer as almost autonomous car.

zzzzzzzzzz continued his FUD campaign:

“All the videos reposted by Musk and Tesla salesmen teach you that it is ok to drive with hands off the wheel assuming a car can drive on it’s own.”

And if you repeat this Big Lie enough times, it will actually become true, right zzzzzzzzzz? 🙄

It’s too bad that you’re allowed to commit fraud as often as you like in promoting your short-selling Tesla stock position on InsideEVs.

Nix is absolutely correct, as usual.

The Consumer Reports article, which if it didn’t kick off this fake controversy, then at least poured gasoline on it, called on Tesla to disable Autopilot… not merely AutoSteer. The article was entitled “Tesla’s Autopilot: Too Much Autonomy Too Soon”. Note that says “Autopilot”, not “AutoSteer”. The word “Autopilot” appeared no less than 17 times in that article calling on Tesla to put a moratorium on its use. The word “AutoSteer” appeared only twice, the first time several paragraphs into the article. If you doubt this is true, check for yourself; I’ve linked it below.

Consumer Reports is definitely to blame for greatly adding to the confusion between AutoSteer and Autopilot.

Consumer Reports called for Tesla to disable Auto-steer until it can force drivers to keep their hands on the wheel. The problem CR and others have with the FL crash is not AEB. The problem is Auto-steer encouraging drivers to take their eyes off the road for extended periods.

as sven properly pointed out, the braking system is part of the autopilot system when the news is good, but it is separate from the autopilot system when the news is not so good.

Except that this is the exact opposite of the truth. It’s the Tesla bashers who asserted the single fatality reported under AutoSteer was the fault of “Autopilot”, then when videos started appearing which actually show Autopilot preventing accidents, Tesla bashers showed how two-faced they are by claiming that Tesla’s automatic emergency braking system was separate, and not a part of Autopilot.

You FUDsters want to have it both ways.

Anyone who doubts this is true need only compare the comments following these two InsideEVs’ articles on the subject:

The Tesla over reacted to a car slowing down which led to an accident from behind that didn’t need to happen.

The car in front didn’t even stop, it just slowed down, but the Tesla over reacted and braked more than it should have. The Tesla brake checked the car behind.

Yes, unfortunate consequence of technology. I modulate my braking and stopping distance to use up all the space in front of me so as to give the vehicle behind me adequate room. Infact it is almost reflex for me to glance at the rear view mirror while braking.

I used to do the same thing. That is until I was hit so hard in my BMW X5, that the woman pushed me into the vehicle in front of me. Now, let’s be clear that my rear wheels were on her hood, but I now give a little more room ahead when braking in these situations. As has been said, it is each drivers responsibility to not hit the car in front, not to make sure the car behind you does not hit you.

It’s still 100% the fault of the driver behind. You’re supposed to keep enough distance that you can stop if the car ahead suddenly does. And this was not maximum breaking by the Model S driver – and nor does the Model S stop especially quickly. It is too heavy for that.

“heavy” doesn’t matter that much for straight line one-time braking distance. It is more about tires. Heavier weight increases friction force even if it isn’t exactly linear. And brakes on any contemporary car today are able to lock wheels to create maximum possible friction, at least for one braking round.

Car & driver gives 160-174 feet 70-0 for Model S
It is a bit better than many regular passenger cars.

Cornering is what may be worse with heavier car. And of course soft performance tires on heavy car will be converted to particulate matter and poison people around at much higher rate, just like some “clean diesel”.

AEB prevents frontal collision but diver reacting, and slamming the brakes results in rear end collision. One day they will get better, but can you really trust the AEB and let it do it’s job assuming it would have used up more of the space to slow down instead of slowing down a full car length behind? I would probably have braked too.

I can’t really image a computer system that can prevent morons from tailgating. How to do it really? Slow down your car and turn on big flashing neon on the back window “KEEP DISTANCE YOU @#$#@!!!!”???

Google’s car, with no steering wheel or other driver controls, obviously prevents morons from tailgating.

How do we convince morons to use self-driving cars?

1. Make them cheap, e.g. via car-share
2. Revoke licenses of dangerous drivers
3. Seriously punish driving w/o a license


“Google’s car, with no steering wheel or other driver controls, obviously prevents morons from tailgating.”

Really? That’s not at all obvious to me. As zzzzzzzzz pointed out, just how would a self-driving car go about preventing tailgating?

But if you actually have evidence to support your assertion, please post it.

“Auto Emergency Braking is a feature found on lots of newer, high-end cars today”

Yeah, high-end cars like Hyundai Elantras, Mazda 3s, Subarus, Toyotas

Tesla is saying that AEB is ‘separate and distinct’ from Autopilot, which that’s what Tesla told the Senate Commerce Committee investigating the Florida fatal accident. Either Tesla is lying to Congress or the headline is false.

Or the world is actually more complex than you give it credit for…

Many things may be true, but so far you’re not offering anything substantive.

It’s separate and distinct when it crashes. It’s integral when it works – see Musks own tweets about how “autopilot saves pedestrian”, though it was obviously AEB (if anything) that possibly avoided the person getting run over.

So it’s quite easy really. Separate and distinct when it fails, integral when it works.


Good points.

Too bad InsideEVs isn’t isn’t independent enough to report the correct story.


That’s a bunch of malarkey!

Personal experience. I don’t profess to know whether, or not, AEB was active, but I’ve needed ABS to adequately stop my Tesla, manually, w/in 3 feet of another car’s bumper. It was during AP use in stop & go, when the red alarm recognized a Prius in front coming to a rapid stop. I deliberately waited to see what AP would do, and at the last second laid into the ABS. Not really impressed, here, but as I said, I am not sure AEB is active on my car, or FTM, if AEB can be active during AP use? I remember being taught to “pump the brakes” before ABS existed. You get to the threshold of a skid, modulate back, and then press until a skid again as many times as you can w/in a second(s). After ABS came, driving instruction got simple. You lay into your ABS, if you want the most rapid stop. Tesla’s AP will not save you, and chatter the ABS. For me, it went moderately heavy, but, like I said, I had to reach for the heaviest braking the car is capable of. They say the aim is to “reduce severity” of an impact, not… Read more »

I will never get American driving culture. Apparently you are happy with people following “a car length” behind the car in front?!?

In Europe it’s generally illegal to follow less than 3 seconds behind. At 65 mph you move fourty meters per second. So the appropriate distance to the car ahead is minimum 120 meters, or a bit more than 20 car lengths….

When a car rear-ends another it’s always the fault of the one that rear-ends. It doesn’t matter how unexpected the behavior of the car ahead. You have to drive so that you can stop when the unexpected does happen.

Most people don’t get physics.

It is illegal everywhere, but people ignore legalities, at least in rush hour, the same is the US, or in Germany, or anywhere else. Then when somebody crashes on Autobahn, or sometimes just turn emergency lights on, you have not 2 but a dozen of cars crashing.

When I visit Germany, I’m always shocked at how little room they give each other at high speed. What looks like rude cutting off someone to me, my German friends tell me that is normal.

I look forward to the day when drivers without a clue will have the controls taken over my a computer.

Terawatt said: “In Europe it’s generally illegal to follow less than 3 seconds behind.” Hmmm, well, just because something is illegal when driving doesn’t mean it’s not common. For example, it’s illegal for people in the USA to drive over the speed limit, but many people, quite possibly the majority, use the rule of thumb that it’s perfectly acceptable to drive up to 5 MPH over the limit. In the U.S., it is recommended to maintain a following distance of two seconds behind the car in front of you. Yet I can tell you, based on personal experience, that if you try to maintain a 2 second following distance in heavy traffic on a multilane freeway, what will happen is that there will be a constant stream of people pulling over in front of you from the other lane. You’re lucky to be able to maintain a 1.5 second following distance unless traffic is really light. If you, Terawatt, are old enough to drive (which seems questionable), and if you can actually maintain a 3 second following distance on most European multi-lane highways… well, let’s just say I would be quite surprised if that is actually true. I know Europeans… Read more »

Personally, I’d like to see some more videos of Tesla antilock brakes. Part of the Autopilot technology suite!

SparkEV-Fiat500-Leased - M3 Reserved - Bolt- TBD

The trouble with Tesla’s software decision is this: AEB is ONLY engaged with Autopilot.

AEB is DISENGAGED when the driver takes over.

That’s a fundamental error in programming.

AEB should override stupid human tricks.

Well, like I said above. Not true. I’ve ABS stopped down from 150mph straights, and on autocross courses, many times. I usually don’t stab like that, but consider myself as having a pretty refined sense of the binary choice to do it. Tesla’s AP may succumb to the same issues it can generally have with stopped objects, during stop and go. If that is not the case, I can say the car did not “AEB with AP” on. No way. That’s what was curious about it. I called Tesla, lft msg, and the phone tag never stopped. Whatever. Just don’t bank on your “beta” skills. Bank on your driving ability.

I haven’t seen the vid, yet. I should be working 😉

Ok, so having seen it. That sure doesn’t look like hard braking. More like neglect from behind. There’s a recent review of several ACC/AEB packages, in MT I think. Mercedes was the most aggressive. Again, Tesla doesn’t seem to reach for ABS, which could doom you if the guy in front does.

All Tesla has to do with this stuff is come out and say it! “Our AEB doesn’t engage ABS.” I’d find that helpful, but have to read between the hyperbole, experience the beta, or look at other reviews that imply it, or look at Florida accident results to know AP has vision problems with light objects. Users need more info.

I wonder if Tesla’s AEB engages the friction brakes or just uses regen.

Does anyone know?

My understanding is that Tesla’s emergency braking system uses only the friction brakes, not regen. That would be consistent with how pushing the brake pedal in a Tesla car works; it engages the friction brakes only.

However, I can’t be absolutely certain as my Google-fu failed to find any clear-cut statement from Tesla, nor any discussion of the matter on the Tesla Motors Club forum. (Not saying it’s not there; just that I couldn’t find it.)

And a competent human driver would have avoided the accident altogether by braking as soon as the brake lights on the vehicle ahead lit up, giving the vehicle behind the tesla warning that they should slow down. Look at the car in front, see when the brake lights lit up and check when the tesla applied the brakes. There is about a 2 second delay when the Tesla slams on the brakes. Just because the Tesla was able to avoid a rear ender does not mean it was successful. In fact, this video shows that it failed. Any normal driver in this situation would have moved their foot from the gas to the brake pedal as soon as the brake lights on the car in front lit up. Then apply the necessary brake force to slow the vehicle down to avoid hitting them. Not only this, a normal driver would not brake hard and leave a 1 1/2 car length gap between the car in front. This shows that there was no need to brake as hard since there is still room in front. The whole point of defensive driving is to avoid sudden and quick movements such as hard… Read more »

“Not only this, a normal driver would not brake hard and leave a 1 1/2 car length gap between the car in front.”

A legitimate criticism. The system is good at instantly matching the brake input of the car in front (so long as its still moving). I agree that through moderately hard braking it should eat more into the distance between, instead.

In the end, I still feel like I’m criticizing Jimmy Hendrix for his choice of distortion, when the revolution is still his.

My technique is to shift to the brake when the car in front brakes, but give a short sharp brake to get the attention of the following car (to panic them?), then to lift off and use as much space as I can to brake while watching the mirror…. this has worked well for many years.

AEB is found in almost every new car, from the cheapest brands to the most expensive.
No one is questioning that AEB is great and important.

But AEB is not a part of the Autopilot, it is what takes over when humans or the Aupilot fail to do their job.

InsideEVs is almost always unbiased and accurate (and fast to change when corrected) but this is pretty sad…

AEB is a good feature.

But I call BS on this post. It is a completely BS. Any attentive good driver would have been able to prevent crash.

The cars weren’t even stopped. The fact that car ran into the car is because Extreme braking of the left lane AND the driver behind followed too close.

Atlanta are full of idiots. This guy is one of them.

I used to drive in Atlanta all the time.

The fact that this guy doesn’t get the difference between AEB vs. Auto Pilot.

Maybe he should explain to the LA accidents why that driver “disengaged” AEB by braking because she felt that AEB didn’t slow down fast enough…

This is completely useless

It’s getting to the point that ANY Tesla related posting on this site has to be ignored. Drag racing? Obvious poor driving skills? Evaluations of useless features?

What the author did not mention was that because his Tesla (whatever system it used) applied the brakes before he could, his brake lights would have operated a little sooner and so would have given the guy behind a little more time to react and so resulting in a slower and less damaging rear end collision. A cascading beneficial effect.

1/ Both your near collision and the actual one would not have happened if both of you had left a sensible gap between your respective vehicles. The length of a semi-trailer IS NOT ENOUGH at your stated 75mph. A sensible gap – in good conditions – would be at least 3 or 4 times that. This is very basic physics and good driving practise (that, I’m sure, your driving instructor would have told you about). The fact that a huge proportion of drivers are just as unrealistic about their reaction speed and the performance of their cars as you appear to be about yours does not make it right. In fact it makes it more sensible to leave an even bigger gap in front of you to make allowances for their stupidity. Had you done so in this instance, you would not have had to brake so hard and, therefore, the guy behind probably would not have hit you! 2/ Consumer reports did NOT say Tesla should turn of AP – they said Tesla should not allow it to work unless drivers *continuously* hold the steering wheel, which to my mind, is common sense. As you know, under steady conditions… Read more »

Tesla Autopilot saves the life of this lawyer (Attorney) by driving him 20 miles to the hospital.