"Without consistent feedback, it can be tough for a motorist to answer the question: How good a driver am I? In fact, we tend to be overconfident behind the wheel. A risky driver may go for a long time without a crash out of sheer luck, the same way a person who eats a terrible diet may live for decades with no apparent ill effects. And when external feedback does arrive, in the form of a honk or comment from another driver, it is likely to spark cognitive dissonance (What's their problem?) in the face of our carefully constructed sense of self-esteem."