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A model for analyzing traffic accidents that relates unsafe driving to operational and environmental variables, the production of injuries and property damage, and the safety measures that might reduce the incidence and severity of accidents. An accident is conceptualized as having three stages--preaccident, intra-accident, and postaccident--and as passing through a chain of phases, all physically observable, with clearcut outcomes. Emphasis is on the preaccident stage, which consists of four phases: predisposition, initiation, juxtaposition (confrontation with a hazard), and evasion. The intra-accident stage consists of the first-collision phase (impact on vehicle) and second-collision phase (impact on passengers). For the persons involved, the postaccident stage results in initial treatment, emergency transport, and primary treatment. (See also RM-5631, RM-5632, RM-5634, RM-5635, RM-5636, RM-5637.)

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