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Automobiles damaged in collisions in which the main vehicle structure has been underridden or overridden were studied, as well as injuries to occupants of the automobiles. The parameters that affect injuries are listed and discussed, as are the effects of these parameters for each case example. Recommendations are made for modifications of passenger cars, trucks, trailers, and highway furniture to mitigate the severity of injury in underride-override collisions.

The paper represents a distillation and analysis of collision injury cases collected by the UCLA Trauma Research Group from 1960-1969. Injuries are interpreted with relation to specific variables which are thought to represent important factors in collision injury causation and prevention. The methodology is presented as one possible way to view transportation trauma in terms of factors which can be isolated and may lend themselves to manipulation in the cause of traffic safety.