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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]

#21
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.

I disagree. Watch the horizon, e.g. by putting your mouse on it. During the beeping, well before the collision, the horizon moves upward suddenly, indicating that the nose of the Tesla is dipping due to sudden deceleration or braking.

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

#22
post #3
post #2

I thought this an interesting video when Elon retweeted it. Basically the car is responding faster than the people do and keeping things from escalating. That said, having been on 101 when the cars in front start dancing like that I have to say my biggest worry isn't stopping in time its having someone behind me not stop.

I expect an autopilot could deal with that situation much better than a human as well. It should be able to predict if the car behind won't stop. Certainly better than a human driver could (if the human would even notice the car coming from behind with that happening in front). Then, assuming there is some space open in front, as there was in this case, it could accelerate to avoid the collision from behind. Now I'm…

I think the consequences of this would be too significant for Tesla to silently implement. Given an unavoidable rear crash, it could cause a multi-car accident and increase the collision's severity relative to braking.

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

#27
post #7
post #2

I thought this an interesting video when Elon retweeted it. Basically the car is responding faster than the people do and keeping things from escalating. That said, having been on 101 when the cars in front start dancing like that I have to say my biggest worry isn't stopping in time its having someone behind me not stop.

And so was he. The first talking you hear is them telling the kids to stay put until they're sure no one is going to be rear ending them. Does anyone know if these braking systems account for people driving behind you? And if a collision is inevitable, what do they "choose"?

Well I would hope it would choose getting rear ended, particularly because that is the fault of the driver behind you. If you choose to slam into someone instead of letting someone slam into you, you are now at fault.

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

#28
post #3

Earlier quoted context omitted.

I expect an autopilot could deal with that situation much better than a human as well. It should be able to predict if the car behind won't stop. Certainly better than a human driver could (if the human would even notice the car coming from behind with that happening in front). Then, assuming there is some space open in front, as there was in this case, it could accelerate to avoid the collision from behind. Now I'm…

I think the consequences of this would be too significant for Tesla to silently implement. Given an unavoidable rear crash, it could cause a multi-car accident and increase the collision's severity relative to braking.

I was discussing the case of an avoidable rear crash. Vehicle approaching from rear, either not beginning to slow by a minimum expected distance, or slowing, but with apparently insufficient space to come to a stop. Space in front, allowing for safe acceleration. Seems logical to move out of the way, and I don't see any reason why it would increase the chances of a multi-car accident.

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

#29

Earlier quoted context omitted.

Most Tesla's on the road don't have rear facing radar. I don't think the rear facing camera is used for anything other than parking. So, that leaves ultrasound, which has limited range. I would think in theory they could use the camera alone to detect an approaching vehicle, and take some remedial action.

When the car is motionless (e.g. immediately after it has come to a stop from the emergency breaking), does the computer engage the breaks just soft enough so the car stays put? And would this reduce the impact from behind if it were to happen?

I'm curious if you really want the brakes on full when you get hit from behind. It seems the cars would start to crumple in place until firmly together and you overcome friction, getting launched. With the brakes off, you would immediately accelerate, but perhaps with a lesser initial burst.

That's the decision I had to make one day. I saw a car coming to hit me from the rear. I took my foot off the brake and gripped the steering wheel, leaned back and relaxed. It worked out well, but I've always wondered if the brakes make any difference one way or the other.

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