@jmaris from the description it doesn't sound defective in the first place, though.

I just didn't think that was the interesting part of the story.

As far as I can tell, this system wasn't a full autopilot AND the driver was warned that it wasn't full autopilot, so calling it defective because it didn't do what it wasn't supposed to be able to do doesn't really hold water.

It's like me buying a hammer from you and then complaining that it's defective because it can't turn a screw.

No, the driver ignored warnings and abused a tool, using it in a dangerous way it wasn't intended to work.

That's not a defect. That's a driver engaging in risky behavior.