I assume the cars automatic braking and collision detection will just override whatever would cause an accident. Or a person's foot. I was at a stoplight the o

I assume the cars automatic braking and collision detection will just override whatever would cause an accident. Or a person's foot. I was at a stoplight the other day and I was about 30 cars back. I could still see when the light turned green. I counted ~30 seconds before the car in front of me moved at all. I did not make it through the light. If the cars could talk to each other, they could all start moving together (slowly) and then accelerate and spread out, resulting in much higher throughput and preventing traffic jams.