I think equating to the halting problem is silly, but the ISO levels are a bit of a mess. * Level 5 is a vehicle that never needs a human to take over and can

I think equating to the halting problem is silly, but the ISO levels are a bit of a mess. * Level 5 is a vehicle that never needs a human to take over and can drive in "all conditions". Humans do not meet this driving standard. * Level 4 is a vehicle, that within a set of vehicle-defined conditions can drive the vehicle without a human ever having to take over. It refuses to drive unless the conditions are met. So a level 4 car could be a vehicle that can drive in a 1 block area of residential streets only... or something that can drive in way more conditions than I could safely attempt, but refuses to drive in say, whiteout blizzard conditions at night.