Inside, three accelerometers are set at right angles, each providing data on the forces and accelerations to which the brain would be subjected in a crash. Neck Features measuring devices to detect the bending, shearing and tension forces on the neck as the head is thrown forwards and backwards during the impact. Arms Neither arm carries instrumentation. In a crash, arms flail and, although serious injuries are uncommon, it is difficult to provide worthwhile protection against them. Hybrid III's steel ribs are fitted with sensing equipment that records the deflection of the rib cage in the frontal impact.
Injuries result if forces exerted on the chest area, such as from the seat belt, are too great.
Abdomen EuroSID-1 is equipped with sensors to record forces likely to cause abdominal injury. Pelvis EuroSID-1 has instruments fitted in its pelvic girdle. They record lateral forces that may result in fractures or hip-joint dislocation. Load cells in the femur provide information in frontal impact tests on likely injury to all sections, including the hip joint which can suffer from fractures and dislocations. Feet and ankles Assessment of feet and ankle injuries is based on how badly the car is damaged, by measuring distortion and rearward movement of the driver footwell area.