The seatbelt is one of the most important safety features ever invented for the automobile. In 1930, an estimated 30,000 people died every year from vehicular accidents. Doctors urged car manufacturers to make the seatbelt standard on all vehicles, as they were on aircraft, and by 1965 all 50 states mandated seat belts for all cars. Inertia causes all objects in a car to move at the same speed as the car itself, creating the illusion that they are one single moving unit. This illusion is shattered when a car comes to an abrupt stop, since each object has its own, separate inertia. Without a seatbelt, a body's forward momentum would send it forward violently, often resulting in serious bodily injury.All of the following are used to support the author's claim about seatbelts EXCEPT