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Neck injuries resulting from rear end car impacts have attracted increasing attention in recent years. Although usually not life-threatening these injuries can have long-term consequences. The exact mechanism of injury has not yet been established. Several probable mechanisms occurring at different phases during the crash sequence have been suggested by researchers. The accident experience with existing seat and head restraint designs is summarized. The results show that there are many factors influencing the risk of neck injury. A high and fixed-in-position head restraint, positioned close to the head, is beneficial. Also, Individual factors, such as gender and height, and seating position, are shown to have influence on the injury risk.