My head is made of aluminium and covered in flesh-like rubber. Inside, I have three accelerometers set at right angles that measure the forces and accelerations on the brain.
My neck has measuring devices that are used to detect the bending, shearing and tension forces that occur on the neck, as a result of the passenger's head being thrown forwards and backwards during impact.
My steel chest ribs are fitted with equipment that records the deflection of the rib cage and likely chest injuries in a frontal impact.
When I'm in a crash test, my arms fall around in an uncontrolled way. Although serious arm injuries are uncommon, it's difficult to provide passengers with any worthwhile protection - so for this reason, my arms don't carry any instrumentation.
Load cells in my femur provide data on the likely injury to the upper leg area (thigh, pelvis, hip joint and knee) during a frontal impact. I also have a knee slider, which can be used to measure the forces transmitted through my knees.
Instruments fitted inside my lower legs measure bending, shearing, compression and tension, allowing for injury risks to the tibia (shin-bone) and fibula (connecting knee to ankle) to be assessed.