Sure, not Turing test level AI, but the car needs not to just correctly interpret what the other human driver is communicating, it too needs to communicate back, sometimes assertively. Sometimes you need to actually talk to the other driver.
Anecdote: I was driving down a long, narrow country road, lots of turns, space only for 1 car, land rover coming in opposite direction, and another car behind me. We had to verbally negotiate who reverses back 50m to let the others go past. I cannot think how an ML algo could resolve this situation, even if it could, how would it communicate it's intentions to the humans, when flashing your lights isn't enough?