This sounds like a bit of a nightmare. Follow the car ahead of me, if it’s autonomous. How do I know the capabilities of other cars on the road? What if I don’t know and don’t follow, does it revert back to giving me a normal light even if there are a bunch of autonomous cars around?

What about non-vehicle traffic, like bikes and pedestrians?

What happens when there is an accident. How does one argue they had right of way, when all the lights are white and everyone is just crossing their fingers and playing follow the leader?

Does this assume all autonomous vehicles are speaking the same language? Has that standard been established, or is this another format war that will need to play out?

Traffic circles seem like they would play out better. When autonomous cars meet they can negotiate things optimally, while normal cars slot in as they normally would with no change in behavior. Carmel, IN would be a good test bed for that theory.