I learned to drive in Mexico at 13, where there are almost literally no rules or traffic signals (see the black arrow on the wall? that means don't stop). I remember thinking about how different things were when trying to get my driver's license in US at age 16 - almost easier - in spite of how many more rules there were. I wonder how self-driving cars perform when trained in a world of rules and order and are then thrown into complete chaos in other places.

What does training look like? Do self-driving cars only work in certain countries where they have been trained?