. . . [T]here is considerable diversity in driving behavior across vehicle classes: the most dangerous drivers (pickup truck owners) are nearly four times as likely to be involved in fatal accidents as the safest drivers (minivan owners) after controlling for the physical safety attributes of their vehicles. Second, controlling for driver safety produces estimates of the physical safety of interactions between vehicles that closely mirrors theoretical engineering results. Large and heavy vehicles are the safest to be inside during an accident but also cause the most damage to others.