Even easy things are easier when basic steps are taken to make things clear. Note that people seem to find it easy to figure out that we take turns at intersections, too. But even that easy case can be helped by practices like painting big white lines in front of the official stopping places to minimize ambiguity about concepts like “has arrived at the intersection”. And when tricky cases arise, like the judgment call about the threshold for transition to not taking turns because one road is slow and carries little traffic while the other is fast and carries a lot of traffic, it can be appropriate for one person to make the judgment call at leisure and then take a lot of care to communicate that clearly to everyone else.

You go, I go. “Merge,” get it? I figured this out over 40 years ago.

Strategies and norms based on chains of “I know that he knows that she knows that I know that she knows that he knows…” logic naturally break down rapidly when they involve an issue which is significantly ambiguous for every participant.