Psychology
Most drivers rate themselves better than average — that's statistically impossible
In 1981, psychologist Ola Svenson asked American and Swedish students to rate their own driving skill and safety against the rest of the group. Roughly 90% of the US sample and most of the Swedish sample placed themselves in the top half. Since only half of any group can actually be above the median, most of them were mathematically wrong. The effect, called illusory superiority, shows up across skills, looks and ethics alike.