It'll probably make a lot more sense when you have a majority of cars that can act as a swarm rather than having to tolerate irrational and unpredictable human

It'll probably make a lot more sense when you have a majority of cars that can act as a swarm rather than having to tolerate irrational and unpredictable human drivers. I can imagine there will be eventually some sort of standard for near field communication of autonomous drivers that can give hints about behavior rather than needing to infer them. Doesn't even need to be trusted or authenticated, a driver can just make more detailed signals than the human readable yellow and red lights that we currently use. Even just being able to say that you'll be turning in 1KM would make things significantly more efficient to navigate around. It extends even further if you want to have drivers like ambulances and fire trucks to have "sudo" powers, autonomous drivers can get themselves into a formation to allow the vehicle through before it is even visible over the horizon.