> Of course, there's always a race condition and potential for deadlock when two cars arrive simultaneously at an empty intersection, and waving people through

> Of course, there's always a race condition and potential for deadlock when two cars arrive simultaneously at an empty intersection, and waving people through is a safe and necessary way to solve that. There are very clear right-of-way rules for this situation, and if both drivers can manage to remember those simple rules, no hand signals will be needed.