Well actually yes they do. The main reason seat belts are so effective is through reduction in the rate of aortic tears. The aorta in the thorax is held in position by fibrous tissue and cannot move forward with sudden deceleration. The arch and the remainder is connected to the heart and moves forward violently in this scenario ripping it away from the portion stuck to the back. With a seat belt although there is sudden stopping there is no acceleration of the body toward a completely immovable object (steering wheel/dashboard/inflating airbag), thus the fibers in the belt have just enough give to bruise and batter the chest wall without causing ripping up to around 60mph net stopping force. With four point belts (rally cars) and further modifications as in formula one cars one can achieve much more than this.



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No harm done, but had I been going faster and braked harder, serious vet bills or no more Buffy
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