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A study investigated the cognitive underpinnings of consumers’ beliefs and confidence in their beliefs about fully automated vehicles. Following previous research, opinions about self-driving cars tended to be mixed. The most negative views were held by consumers who had the least knowledge of self-driving cars. Low trust in technology was also associated with more negative views. Although consumers were generally confident in their views of self-driving cars, many were uninformed about them. Consumers’ confidence in their beliefs was more strongly correlated with perceived knowledge and general confidence than real expertise. Thus, consumers’ confidence in their opinions about fully automated vehicles appears to be driven by cognitions that are largely superfluous. A mediation analysis suggests that general self-confidence influences judgmental confidence by affecting perceived judgment relevant …