Their cars seem to drive okay on vision only. The interesting thing about their end to end machine learning approach is that it has to be (at least partially)

Their cars seem to drive okay on vision only. The interesting thing about their end to end machine learning approach is that it has to be (at least partially) retrained not just for every country, but every state - every place that has different road rules. It's going to be a long time before they get thru every region they sell cars in.