I agree with your thought experiments and also agree that overall it's a valid, technically accurate interpretation. So, this may be where we agree to disagree.
I still stand by level 3 != level 4 in terms of real world liability.
Level 3 allows too much wiggle room and sloppiness to be able to legally shift liability away from the driver. At that point you're playing that "intervention period" length. Manufacturers claiming Level 3 will want to lower it as much as possible, regulators raise it. To me, Level 3 simply shouldn't exist.
Only at Level 4 is the expectation, without a doubt, the machine is in control. A person in the driver seat is optional because the steering wheel and pedals are as well. When people bought "Full Self Driving" they seriously believe "when can I go to sleep?" ability is where it belongs, which always put the expectation at Level 4.
Saying level 3 shouldn't exist makes sense. But I don't think the liability gets very blurry as long as the intervention period is properly documented.
It looked like the Mercedes system is 10 seconds which seems like plenty to me.
And while it would be nice to sleep I'll be pretty happy just looking away from the road.
I still stand by level 3 != level 4 in terms of real world liability.
Level 3 allows too much wiggle room and sloppiness to be able to legally shift liability away from the driver. At that point you're playing that "intervention period" length. Manufacturers claiming Level 3 will want to lower it as much as possible, regulators raise it. To me, Level 3 simply shouldn't exist.
Only at Level 4 is the expectation, without a doubt, the machine is in control. A person in the driver seat is optional because the steering wheel and pedals are as well. When people bought "Full Self Driving" they seriously believe "when can I go to sleep?" ability is where it belongs, which always put the expectation at Level 4.