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Waymo issued a recall after two robotaxis crashed into the same pickup truck (www.engadget.com)

submitted 10 months ago by [email protected] to c/[email protected]

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Last year, two Waymo robotaxis in Phoenix "made contact" with the same pickup truck that was in the midst of being towed, which prompted the Alphabet subsidiary to issue a recall on its vehicles' software. A "recall" in this case meant rolling out a software update after investigating the issue and determining its root cause.

In a blog post, Waymo has revealed that on December 11, 2023, one of its robotaxis collided with a backwards-facing pickup truck being towed ahead of it. The company says the truck was being towed improperly and was angled across a center turn lane and a traffic lane. Apparently, the tow truck didn't pull over after the incident, and another Waymo vehicle came into contact with the pickup truck a few minutes later. Waymo didn't elaborate on what it meant by saying that its robotaxis "made contact" with the pickup truck, but it did say that the incidents resulted in no injuries and only minor vehicle damage. The self-driving vehicles involved in the collisions weren't carrying any passenger.

After an investigation, Waymo found that its software had incorrectly predicted the future movements of the pickup truck due to "persistent orientation mismatch" between the towed vehicle and the one towing it. The company developed and validated a fix for its software to prevent similar incidents in the future and started deploying the update to its fleet on December 20.

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[–] [email protected] 1 points 10 months ago (1 children)

If you're following a vehicle with proper distance and it slams the brakes you should be able to stop in time as you've calculated their trajectory and a safe speed behind.

You dont need to calculate their trajectory. It's enough to know your own.

If a heavy box falls off a truck and stops dead in front of you, you need to be able to stop. That box has no trajectory, so it's an error to include other vehicles trajectories in the safe distance calculation.

Traffic can move through an intersection closely by calculating a safe distance, which may be smaller than the legal definition, but still large enough to stop for anything suddenly appearing on the road. The only thing needed is that the distance is calculated based on your own speed and a visually confirmed position of other things. It can absolutely be done regardless of the speed or direction of other vehicles.

Anyway. A backwards facing truck is a weird thing to misinterpret. Trucks sometimes face backwards for whatever reasons.

It would be interesting to know how the self driving car would react to a ghost driver.

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago) (1 children)

You dont need to calculate their trajectory. It’s enough to know your own.

This doesn't make sense. It's why I was saying the car won't move at a stop light when it goes green until the car is half way down the street.

If the car is 2.5 seconds ahead of me at 60mph on the highway, it's only 2.5 seconds ahead of me if the other car is doing 60 mph. If the car is doing 0mph then I'm going to crash into it.

It needs to know how fast and what direction the obstacle is going, and how to calculate the rate of acceleration/deceleration and extrapolate from there.

[–] [email protected] 0 points 10 months ago (1 children)

2.5 seconds at 60 mph is more than enough to come to a full stop. If the car in front of you dropped an anvil (traveling at 0 mph) on the road, you could stop before crashing into the anvil. You do not need to drive into the other cars trajectory path.

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago) (1 children)

You can't be driving behind that vehicles at 60mph with 2.5s WITHOUT knowing it's trajectory.

You keep trying to saying it doesn't need to know the trajectory of all objects around it, but that's not true.

[–] [email protected] 1 points 10 months ago (1 children)

Yes you can. It is a stopping distance. 2.5 seconds at 60 mph is 220 feet. A car can brake from 60 to 0 in less than 220 feet. It will take longer than 2.5 seconds to do, but it won't hit the object which originally was 2.5 seconds ahead.

[–] [email protected] 2 points 10 months ago (1 children)

Maybe a straight behind isn't as good an example, although it is calculating the likelihood of it continuing to go straight.

An oncoming car, drifting out of the lane towards your lane.

It's not going to hit you until it's in your path, but the trajectory of it coming towards you is in your path.

If you don't consider where it's going and how fast it's going, you won't know if it's going to enter your lane before you pass it.

If you're only trying to avoid hitting objects and its not in your path until the last quarter second, you won't take appropriate actions because you don't know it's coming at you.

All these measurements are taken as time between you and them and it uses that info to calculate the trajectories.

[–] [email protected] 1 points 10 months ago

Yes I know and it should. What I am saying is that the trajectory calculations should never be allowed to override the basic collision calculations, like it did in this case.

It does not matter if the towed truck appeared to have a different trajectory than it actually had, because it was very obviously in the range of collision.

Do you have a reverse sensor in your car that beeps when you're close to stuff?

It was the self driving car that drove into the tow truck. All it's sensors must've been beeping, and it still decided to keep driving.