Humans will also adapt. If there are local driving quirks in an area that the automated cars don't follow, after watching the automated cars fail to follow them a few times, people will account for the unexpected behavior.
This is already an issue humans solve in the context of tourists driving through town, who aren't accustom to local rules like "First driver at an intersection gets to make a left on green instead of yielding to the column of oncoming straight traffic."
This is already an issue humans solve in the context of tourists driving through town, who aren't accustom to local rules like "First driver at an intersection gets to make a left on green instead of yielding to the column of oncoming straight traffic."