I think people are willing to trust the GPS precisely because because they don&#x27;t understand that the routing is based on a cost function that was ultimately determined by humans with imperfect knowledge about the conditions on every road in the country (not to mention variable conditions that can&#x27;t be known precisely in advance, like weather and traffic). When you understand that the route is simply the output of an algorithm whose input may or may not be accurate, you&#x27;re a lot more willing to disregard the route if other information contradicts it than if you believe that the GPS is somehow telling you the &quot;best&quot; route.