A motor vehicle accident causal system : the human element.

A motor vehicle accident causal reporting system, from a human factors viewpoint, is presented. The system is based upon a cause and effect relationship; the effect being the primary failure, non performance, or behaviour which led directly to the collision situation; the cause being the reasons for the human failure, non performance, or behaviour. A causal reporting system for the utilization by professional accident investigation research groups is discussed in terms of primary or principal causes, severity increasing factors, and relevant conditions.