What the answer glances over is that even with just 3% of the time requiring human assistance (2 minutes out of every hour) the term ‘autonomous vehicle’ is not really applicable anymore in the sense everybody is using/understanding that term. The idea behind that term assumed ‘full’ autonomy. Self driving cars. And there is no reason to assume that this is still in sight. The answer puts that ‘self-driving car’ on the shelf.

PS. Human assistent seems to me a difficult job, given the constant speed and concentration requirements.