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They have an "urgent stop" button, which passengers can use. Presumably that's unnecessary, though, as I'd expect the vehicle can detect an accident and will stop. Tow trucks could take over, at that point.

Emergency steering wheel app.

And who pays for the insurance? And who is blamed for the accident? I'd be surprised if Google is accepting these costs.

In accidents involving self driving, it could be easier to go to the root cause of accident, as these cars shall have lots of data for that incident and environment (like a black box).

With a tow truck.

Some places have laws requiring you to move the vehicle off the road if it steerable. There has to be some way to move the vehicle manually.

Exactly this. Minor collisions should move to the side of the road ASAP.