Exactly this. I’ve long had a thought that if all automobiles were like the Invisible Boatmobile from SpongeBob, then most of the suble cues between humans would make it easier to understand intentions, with corresponding reduction in misapprehension and collisions.

That said, humans simply are poorly adapted to traveling at 100 kph, so whose to say if these cues are even understandable at high speed. And of course, it’s downright impossible to see those details when blinded by mutual headlights on a rural highway at night.