It's easy to say where the line is right now, but you imply that at some point "intent" might be usurped by the computer. I don't think there's any clear way to define that limit. If the driver merely tells the computer where to go ("the 7/11 on 4th Street") and the car does the rest, does that cross the line? Does that usurp the "core human task of driving?" You are ready to let computers calculate the most efficient way to brake, and I am ready to let them do much more, as soon as the technology is available and reliable. Where is there a clear line in between?