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The National Automotive Sampling System’s Crashworthiness Data System (NASS CDS) was used to study rear occupant injuries in frontal crashes. The risks of injury for the rear passengers of different age groups were calculated and compared to the risks of injury for the front occupants. Furthermore, the risks of injury were investigated for the rear and front adult occupants over model years of vehicles. Distribution of injuries among body regions and vehicle contact points were also investigated for the rear adult occupants. While the rear occupants were more protected than the front occupants in most of the groups studied, an increasing trend was observed in the risk of injury of the rear adult occupants over the model years of the vehicles.