Seat belts and reclining seats.

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[2]  R. Schneider,et al.  "HANGMAN'S FRACTURE" OF THE CERVICAL SPINE. , 1965, Journal of neurosurgery.

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[4]  G. Sköld,et al.  Spinal injuries in belt-wearing car occupants killed by head-on collisions. , 1977, Injury.