One reason, is that it could still be dangerous. For example, they won’t be able to obey short term stop signs. What I mean by that is, that the car could wait to long at a stop sign hold everyone up. Another example, is that the car won’t be able to tell when little bits of paper is harmless. For instance, say if you are on the highway and a little bit of paper passes your car, and it might stop fast causing an accident.
Another reason is that there are a lot of human mistakes. I say this because, if you are at a stop sign and the car slows down to let the pedestrian walk the driver could panic. Another example is that the