Passenger complaints about driver behaviors.

Fifty-two couples were surveyed about their behavior while driving together. Each was asked to individually rate the driver's behavior, the passenger's amount of complaining about the driver's behavior, the effect of that complaining on the driver, the driver's use of vengeance while driving, and the driver's ability and safety. Drivers and passengers gave similar responses: the riskier the driver's behavior, the more the passenger complained.