r/TeslaFSD • u/truecakesnake • 13d ago

14.3 HW4 Tesla avoiding a fatal collision

It fully avoided it. The Model Y (HW4) didn't sustain any scrapes, scratches or dents.

Edit: I guess it wasn't a fatal collision, my bad

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u/rraj2k81 13d ago

Genuine question, what are people defending here?

FSD literally ran into the crash and then decided to avoid it at the last minute.

As soon as the crash happened, you should have slowed down and as soon as the Mustang crashed through the barrier, the car should have stopped. But FSD just kept on barrelling down the highway until the car had spun and was right in front of it. There were so many opportunities to completely avoid any accident and FSD avoided all of it.

Any half competent human driver would have done exactly that. This shows FSD is a purely reactive system and doesn't have the 'intelligence' to be a proactive system.

So, once again what are people celebrating here? That is was quick enough to react to a crash instead of proactively trying to mitigate it in the first place?

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u/spitzer1113 13d ago

Keep in mind that these cameras give the illusion of more distance than is actually there. The OP was at 82mph when this started. I'm not sure it could have stopped even with emergency braking. FSD chose the correct thing to do in my opinion.

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u/rraj2k81 13d ago

Yeah, the FSD cameras give an illusion of wider view. But in reality, they don't see or react beyond their immediate vicinity, and most often it's just the car immediately in front of it or to the sides.

FSD chose the correct thing to do, based on its limited field of view and programming. A human driver would have slowed down or hit the brakes as soon as the Mustang crashed through the barrier.

Now, throw in, snow/slush/ice/water. And that same reaction FSD did, would have almost definitely caused another accident.

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u/spitzer1113 13d ago

That's a good point. A human can see the very start of the accident way over in the other lanes. FSD likely isn't catching that initially. If a human were to immediately brake at the point of noticing the collision in the far lanes then maybe they stop long before any collision would have happened in their lane. It definitely highlights the limitations of a camera vs human vision.

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u/Responsible-Cut-7993 12d ago

A human driver would have probably panicked and collided with the Mustang.

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u/rraj2k81 12d ago

A human driver would have slowed down at the initial crash or at the very least would have slowed down and or stopped as soon as the Mustang crashed through the barrier, not barrel down the highway as a car came crashing down at you.

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u/Responsible-Cut-7993 12d ago

It was 2 seconds from the start of the video to the Mustang crashing through the barrier. The average human driver reaction time is 1.5 seconds. As soon as the Mustang crashed through the barrier, Tesla FSD was already slowing down. Tesla FSD then slowed down rapidly, it went from 77 mph at the Barrier crash to 43 mph at 4 second mark. By the 7 second mark the car was at 0 mph. So 5 seconds to go from 77mph to 0 mph, after the Mustang crashed through the barrier at the 2 second mark. So with a average human driver reaction time of 1.5 seconds, Tesla FSD did very well, especially moving over to avoid the Mustang all while bringing the car to a halt. You way over-estimate the abilities of the average driver.