Contrary to many here, I feel that it's perfectly reasonable to have a backup human driver if they are trained to act accordingly . The Japanese pointing-and-calling technique comes to mind as a good example of keeping drivers engaged: they would have to continuously, actively point at dangers and at the car's appropriate response. ▶ this video (quite fascinating to watch) Combine this with short sessions (not driving around for hours with nothing to do), and I think the driver would have had a reasonable chance of preventing this accident.
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