As long as robot cars roam public streets and highways, they will occasionally kill people. That’s an ugly truth that no one in the driverless vehicle industry can deny.

Will those robot cars kill people at significantly lower rates than drunk, stoned, tired or distracted human drivers do now? Automakers, technology companies, politicians and regulators are betting they will, as driverless vehicles are rolling out faster than almost anyone expected as recently as a year ago.

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