[TangoTrotFox]

I don't think the goal should be seen as perfect driving, and that is likely impossible in any case. You can take the most extreme scenario that AI or human can possibly successfully overcome, and then make it just slightly more challenging to induce failure. You'll always be able to 'break' a driver's ability to correctly respond whether they're human or AI. So the goal, to start, should simply be to overcome humans on average. If a human will end up in a fatal crash every x 'average' miles, then an AI is a success if gets into fatal crashes at an average rate less than x.