As of yet are there any standards for the effectiveness of these systems, it's bit like the headlight effectiveness game.
say, heavy rain, or spotting small profile vehicles (cycles/bikes), or, even, resuscitating the infamous moose test,
even with the new uk auto steering proposal, but, maybe that was just for motorways, I don't remember seeing any standards.
case in point - the video put up a while back of the guy who survived (mondeo?) after hitting a stationary car in motorway fast lane, after rounding a bend.