I'm surprised that posters on here, all of whom will have had past issues with their PC , are so confident they are willing to risk their lives to a computer. What happens for example when the car picks up a computer virus through its 4G connection? Or when its hard disks fail. Or during an electrical storm. And can you imagine the problems of the average garage mechanic trying to service one!
Dont forget that if these cars become commonplace there will be a fair proportion of their human passengers who dont have driving licenses and who cant take over. Even larger numbers of those who are way out of practice.
As for coming home from the pub. Dream on - the lwa will likely still treat you as "in charge".