Our reflexes are fine at about 100 Hz. That gives up to 2m distance at rival urban speeds before action and drivers shouldn't rely just on reflexes anyway. The

Our reflexes are fine at about 100 Hz. That gives up to 2m distance at rival urban speeds before action and drivers shouldn't rely just on reflexes anyway. The problem is not reflexes, the problem is some drivers being dumb and a bunch of others distracted. You could mandate a very limited systento prevent both without solving the self driving car problem at all. (I recommend looking at trains for this solution.) It is being done because it is attractive, not because it is necessary.