Given the information available on how people actually drive (besides that mentioned directly in this article), how would one distinguish the automated car beha

Given the information available on how people actually drive (besides that mentioned directly in this article), how would one distinguish the automated car behaving "strangely" from regular human driver weirdness? I bet if you quiz twenty of your driving friends, you'll find more than three opinions on the right way to clear a four-way stop, for example.