This is why many are worried about Level 3 autonomy vehicles -- that is, driver assist where the car can drive ~95% of the time, but the driver may need to inte

This is why many are worried about Level 3 autonomy vehicles -- that is, driver assist where the car can drive ~95% of the time, but the driver may need to intervene at any moment. So far all the studies I've seen indicate that the driver loses attentiveness whether they mean to or not, and the disengagement times are in multiple seconds. Personally, I think a system needs to work well enough to drive itself the whole trip, or be dumb enough to act as cruise control with some crash prevention built in, but otherwise force the driver to be on task.