> We can also pickup on subtle clues in posture, through eye contact and even through the driving style of another person. I think this is what a lot of people

> We can also pickup on subtle clues in posture, through eye contact and even through the driving style of another person. I think this is what a lot of people take for granted. Driving anywhere where there is another vehicle immediately becomes a social activity. There is a tacit agreement to work within the framework of the enforced driving laws, but beyond that there is a social agreement as to who is doing that. Even which driving laws we follow when and were is fluid, but relatively cohesive among drivers. It's why pedestrians try to make eye contact with drivers. It's why drivers make eye contact when there is even an iota of ambiguity on who has the right of way. It's why almost no one drives at the posted speed on a high way and we usually go as fast as the fastest lead driver. It's why we gesture, flash our lights, honk, and sometimes curse. We've built vehicles to communicate as much as possible, but that is still not even an ounce of what we can communicate with our eyes. And sure, when vehicles communicate with each other, that will be even better. In the meantime you've got different actors using incompatible protocols.