In the Smart City you won’t allow any driven cars. You will park and use your credit card to hire an autonomous vehicle which will run along dedicated tracks.
One advantage of this is that there will be no need for precise digital road mapping and another advantage is that, as Kure puts it “when you’re hit on the train track it’s your fault not the train’s fault.”

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By far the most sensible explanation of how autonomous cars will save lives and money – there will be no pedestrians and no drivers to worry about hitting.