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Tesla footage of braking before crash ahead [video]

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Re: Tesla footage of braking before crash ahead [video]

#101
post #99
post #62

Earlier quoted context omitted.

Link? The Tesla would be aware of the cars behind it as well, so this sounds unlikely

At least with the original sensor suite, Teslas are not aware of cars behind them, except for within a couple feet with the ultrasonic sensors. There is no rear radar and the rear camera data is not processed.

> There is no rear radar and the rear camera data is not processed.

Erm (not a radar but cameras + CV/ML)

https://www.youtube.com/watch?v=PUw_DMaQ264

Re: Tesla footage of braking before crash ahead [video]

#103
post #60

do the cars have some serious computer hardware or is it really good code/cloud assisted computation? Maybe ANN's active while driving?

It must all be local. You couldn't possibly rely on any kind of network link for a hard realtime task like driving.

Re: Tesla footage of braking before crash ahead [video]

#104

What puzzles me here is that the SUV flips over after being hit in the right-rear corner by a relatively small car and bumping into the side barrier. Flipping over in a case like this looks more likely to happen to an SUV than a lower-centered car, and makes me question the safety of SUVs.

This is a commonly known problem of SUVs, their center of gravity is a lot higher so they're a lot easier to flip over. That's why I'm puzzled by people who buy urban SUVs, that is, jeep-like cars that they never intend to use off-road.

Quite often they're a fashion statement more than anything else.

Re: Tesla footage of braking before crash ahead [video]

#105
post #67

This is great video to study on many levels beyond self-driving car. Some observations: * The car behind didn't show turn signal so probably driver wasn't paying attention. * A small car escaping with not too much damage while SUV rolls over many times * From physics point of view, the car behind produced almost perfect torque that started horizontal spin on SUV * Collisions with barrier at high speed can produce lot…

I'm feeling rather dumb, but can't really intuitively understand the physics here. I see a small car hitting a pretty huge one and yet spins the huge one several times. I always thought those bigger cars are safer / stronger / more resistant to hits?

Is it purely because it hit it at the corner, so all the force went into the "spinning axis"? (did I say I feel dumb?)

Re: Tesla footage of braking before crash ahead [video]

#106
post #60

do the cars have some serious computer hardware or is it really good code/cloud assisted computation? Maybe ANN's active while driving?

I believe it's onboard, they have an onboard GPU - cloud-assisted would have latency problems and would also have problems in tunnels and areas with bad reception.

Re: Tesla footage of braking before crash ahead [video]

#107

What puzzles me here is that the SUV flips over after being hit in the right-rear corner by a relatively small car and bumping into the side barrier. Flipping over in a case like this looks more likely to happen to an SUV than a lower-centered car, and makes me question the safety of SUVs.

This is a commonly known problem of SUVs, their center of gravity is a lot higher so they're a lot easier to flip over. That's why I'm puzzled by people who buy urban SUVs, that is, jeep-like cars that they never intend to use off-road.

People like the visibility from sitting higher. Also, "bigger = safer" is a common thought process.

Re: Tesla footage of braking before crash ahead [video]

#108
post #4

I was very confused about this video until I watched it with the sound on. The Tesla beeps at the driver clearly before the accident has occurred, but doesn't appear to decelerate until afterwards.

Most automatic systems brake proportionally to danger. On their own (without driver assistance) the goal is usually to bring an accident down to a "safe" speed like 30mph rather than prevent the crash completely. I guess the point is to strike a balance between trust in the automatic systems and trust in the driver to make the right decisions. Another way to look at it is that the system is designed to protect you, n…

Right - automatic braking is for saving lives, not saving cars.

Re: Tesla footage of braking before crash ahead [video]

#109
post #53
post #51

My understanding is that a lot of recent year car models at least in Europe come with a safety feature exactly like this. Here is the video promoting Skoda's "Front Assistant" feature: https://www.youtube.com/watch?v=ounFkvTuobY If Skoda has it I am sure that all other models in the VW Group's line (VW, Audi, Seat etc) should have it.

That's not the same. The Skoda video only shows detection of the car in front of you and responding to that. In this case the Tesla also bounces the radar under that vehicle and responds to the motion of the car in front of the car in front of you. If you watch the video again carefully, the Tesla alerts before the car in front brakes, because the car in front of that is braking.

You are right, this video only hints at this at the end but if you read closely the specs Skoda seems to promise exactly that - automatic breaking to avoid collision. Here is a blurb on their Front Assistant feature (http://www.euroncap.com/en/ratings-rewards/euro-ncap-advance...)

"Skoda Front Assistant is a system designed to help avoid or to mitigate accidents into the rear of preceding traffic. A long-range radar, positioned at the front of the car, can detect vehicles up to 80m ahead which the car is likely to hit unless action is taken."

Keep in mind, Skoda is not an upscale brand, they are on the budget end of things. The VW and Audi models might/should have better systems.

The new Peugeot 308 also offers a 'Emergency Collision Autonomous Braking System' (http://www.peugeot.co.uk/showroom/308/5-door/p=safety/) but on closer look this is actually 'an automatic brake application to reduce speed by a maximum of 12mph to reduce the severity of impact'. Much less useful, but at least moving in the right direction.

Re: Tesla footage of braking before crash ahead [video]

#110
post #101
post #99

Earlier quoted context omitted.

At least with the original sensor suite, Teslas are not aware of cars behind them, except for within a couple feet with the ultrasonic sensors. There is no rear radar and the rear camera data is not processed.

> There is no rear radar and the rear camera data is not processed. Erm (not a radar but cameras + CV/ML) https://www.youtube.com/watch?v=PUw_DMaQ264

That's the new sensor suite.
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