From experience I can say that's it's pretty disturbing when a human driver breaks your model, too. And this happens more often than I'd like - I was second in

From experience I can say that's it's pretty disturbing when a human driver breaks your model, too. And this happens more often than I'd like - I was second in a set of pedestrians about to cross the street (two lane arterial with a 25mph limit - heavily used by both cars and peds - at a cross walk I use several times a week) - the guy in front of me and I both judged that the driver was looking in our direction (it was dark admittedly but street is well-lit) and the car slowed in a fashion that led us to think it was going to stop. The fellow in front of me steps in front of the car which suddenly accelerates and hits him knocking him down. Immediately before impact it decelerates and comes to a stop. The fellow ended more shaken up than anything else, but it was a very near thing and a reminder that it's precisely that assumption of the predictability of human drivers that fails in many crash situations. In other words, your judgement that you understand what other drivers are going to do is more fragile than you imagine.