[icc97]

There's a difference between active and passive use of self-driving with the current technology.

Passive self-driving systems that take over when the human gets distracted/unwell are great because human vision exceeds computers where as computers are always alert. This would capture the case you describe, I think it would also have a massive improvement for when bus/lorry drivers should collapse at the wheel (Elon Musk used this as a valid use case for Tesla auto-pilot in the Tesla Semi unveiling).

However active self-driving systems (e.g. Tesla's auto-pilot) are currently worse because they rely on computer vision and humans to be always alert.