If you're the owner of the car then I'd say it doesn't change - you chose to take that vehicle out on the road knowing it didn't have a way for you to control it. You can take the steering wheel off of your car with a wrench, you could build a computer to steer it for you, you're still primarily responsible as the owner.
The owner could then try to go after the company, but they're still ultimately responsible even if the company doesn't cover the cost for them
If you are in a vehicle where there is no ability for you to prevent it from hitting you, then the responsibility falls in the manufacturer of the driverless vehicle.
You are expected to be in control, or be able to be in control at all times. If there is such a possibility, anyways. If there isn't, that means the manufacturer is the one in control.
I mean, I'm not a judge, so we'll have to see, but it seems obvious to me that the existence of a wheel implies that sometimes you may need the wheel. And that if there is no wheel, it implies that the manufacturer of the car is saying that you won't need one and their own software is better in every situation.
