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If there was an accident and the cops ask you "why did you break suddenly?" and you say something reasonable that's not "to commit insurance fraud" you probably won't be at fault. It's the responsibility of the person behind you to keep a safe following distance.

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I have had the "pleasure" of driving alongside and behind Cruise's vehicles on many occasions here in San Francisco. They will stop dramatically in the middle of a block (empty, no traffic, no pedestrians), edge forward, dramatically stop again, go halfway through the intersection and again...dramatically stop.

It feels to me like whoever has written their braking algorithm is using bang bang control.

Sure, but that an issue of evidence. Google, Uber, Tesla, etc. have source code, records, emails, reports, etc. that can potentially prove their cars just break because they aren't good enough drivers. And they have deep enough pockets that lawyers will go after them.

1000% sure Google will end up writing a check if someone dies because they rear-ended a google car that suddenly hit the breaks.

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