I&#x27;d expect major mechanical problems with robots, like &quot;the vision sensor died in the middle of an interstate,&quot; to be about as rare as major mechanical problems with humans, like &quot;they had a heart attack in the middle of an interstate.&quot; If not rarer.<p>We&#x27;re already okay with the possibility that a human might drop dead in the middle of an interstate and lose control and more humans might be injured or killed as a result. As long as it is not <i>more</i> likely that a self-driving car will drop dead, I don&#x27;t see why it&#x27;s any different.<p>(And this isn&#x27;t even getting into things like the possibility of catastrophic failure being lower and the options for recovery being much higher. You can run two robots with redundant hardware; you can&#x27;t run two humans quite as easily. A human who loses vision will lose their concentration; a robot that loses vision can use its last known positions of nearby cars to attempt to pull over immediately in an orderly fashion.)