Liability for self-driving cars is a topic long discussed and still not completely resolved. Take a look at https://en.wikipedia.org/wiki/Self-driving_car_liability for examples.

The only level 3 system in production (that I'm aware of, at least) is Mercedes', and they have liability while the car is driving itself. It shifts back to the driver 10 seconds (IIRC) after the system notifies the driver he/she must take over.