Sure, but let's say it would be globally optimal to slow down and let you in. You could imagine this only being done for cars of the same brand, which is diffe

Sure, but let's say it would be globally optimal to slow down and let you in. You could imagine this only being done for cars of the same brand, which is different than explicitly attacking competitors. Regulation is likely that answer, but I have my doubts that "behaving like ants" will be the default behavior.