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Crash test dummies. Hybrid III adult-sized crash test dummies. These dummies are used to test vehicle safety. Their sensors provide information about the forces experienced by humans in frontal impact situations. They are also used to test vehicle safety restraints. The neck of a Hybrid III dummy simulates the rotation, flexion and extension of a human neck. The torso contains 6 strong steel ribs that simulate the deflection of forces by the human chest. The femur and tibia (thigh and shin bones) and ankle bone of a Hybrid III can be used to predict bone fractures and ligament injuries. Photographed at the Transport Research Laboratory (TRL), UK. (KEYSTONE/SCIENCE PHOTO LIBRARY/TRL LTD.)