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Suppose they have done it... it really works... their driver does much better than people driven vehicles..
Unfortunately it may be a de-evolution of people. As technology becomes better and more part of our lives, we lose abilities. We can no longer survive outside our cities with our supermarkets.

Isaac Asimov had some really good insights. Some technologies save us, and some diminish us. WE have to be careful with it.
Also, the added electromagnetic burden may or may not be a problem.
Also, what happens to the radar when mud covers the sensor?