I think most humans can apply proper reason to driving behaviours. How would a computer treat a crosswalk at an intersection with people milling around? What does the computer do when faced with a cow on a rural road? Does a computer allow the car to drive over the ball that rolled into the road. What is considered unimportant? Who tells the computer what it should or shouldn't give priority to?
Even under the best conditions, a train with a fixed path, it still needs a human to control it and make judgement calls.
The self-driving cars people want and expect is a fiction. If Elon Musk and others think this is going to be a fruitful endeavour, good luck is all I can say. I am not holding my breath for the day that I can recline in the back seat of my car and sleep while I am driven to Vancouver - and if I can't, what am I paying for?
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