Oh yes, if cars would communicate they would behave better. But they don't have to do that to be effective. If A B C are all driven by humans, C could move ove

Oh yes, if cars would communicate they would behave better. But they don't have to do that to be effective. If A B C are all driven by humans, C could move over or slow down if it sees that B is steering into it. But self driving cars could do that as well. That self driving cars could communicate is an argument for the self driving car, not against it as the parent made it out be.