I don't believe for a nanosecond that there's no need for comms. But I guess we'll see how it plays out.I think you have a car to car communication protocol - 3 wavelengths of the electromagnetic spectrum are monitored in most directions...
I kinda like musk's argument that it's enough for us, it's enough for a car.
There are a few ways your situation could play out (theoretically, let's face it we are no where near use on single track roads ATM). Baseline assumption of you are making is that some gesturing is needed to sort the problem, but really, you and the other car likely both know who is closer to a passing place and there for who should reverse. An AI actually takes all the ego out of it and hopefully suggests the obvious solution. Possibly for tie breakers the more northerly car has to make the first move, this could be mandated (although I dislike that approach). It's also worth bearing in mind that humans fail this task too (road rage, refusal to compromise and do the sensible thing, crashed car etc)
There are lots of other considerations here, but the point is you don't need car to car comms to solve the situation, it's just one way. You could develop a theory of mind equivalent to let the car consider the problem from the other cars perspective (although this is one way to promote accidental self awareness I believe).
Agree level 5 is a way off, but I don't think we are even close enough to advocate one solution over another tbh.
Successfully driving most of the time in most situations seems within grasp from the v9 videos.
There are daily complex scenarios where several people have to reverse to remove a deadlock, it's rarely as simple as who is nearest a passing point, you usually have no way of knowing how close the other car is to a passing point, and what if both cars are close to one and both reverse?
Just because humans fail at it, doesn't mean communication isn't necessary.
I would also argue that vision only is *not* enough for us, so it's *not* enough for a car. We communicate through hand gestures, facial expressions, headlight flashes, horns. In some cases several people have to get out of the car to work together to agree how to unpick a deadlock.
It is, in my opinion, not going to happen without comms, I guess we'll see!
To look at it from the opposite direction, imagine cars without indicators or brake lights, which are both active communications output, not just passive vision.