> the point of level 4 everywhere under all conditions That isn't level 4, that is level 5. > you are going to have build systems which safely handle that cha

> the point of level 4 everywhere under all conditions That isn't level 4, that is level 5. > you are going to have build systems which safely handle that challenge of inconsistent attention Level 4 is geofenced, but able to perform safely without any level of attention from any human driver. If a human is required to be in the driver's seat to take over on demand, then you are describing level 3, not level 4. > attempting to switch between full self-driving and human oversight frequently would be a safety hazard It shouldn't be. If a self-driving system can't safely reach a place to park in a region, with no human interaction, it is not level 4 in that region.