I don't know, it seems to me that a computer is particularly suited to this problem. I think a computer would be much more accurate in judging the speed of the

I don't know, it seems to me that a computer is particularly suited to this problem. I think a computer would be much more accurate in judging the speed of the approaching bike or the car coming up the side street or in the left lane. The essentially negligible reaction time compared with a human would give significant power to a defensive driving algorithm. And I'd guess probabalistic models are a better predictor of behavior than most people's intuition.