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Accidents and injuries associated with the use of utility oriented equipment, by both commercial and consumer users, involve a broad range of factors. Analysis of these factors and their role in the risk of those activities can be useful to develop effective risk reduction strategies. Generally, these can be identified as mechanism (equipment), human (operator), and environmental factors. This paper briefly looks at the human factors and the human/environmental aspects of these systems. The human/environmental aspects deal with both the mechanical operating, and chemical related environments. Both are associated with certain types of risk.

Accident investigation involves the collection of relevant data from many sources. Frequently, information exists in the form of accident photographs of objects that are no longer available for examination or direct measurement. The use of close-range photogrammetry can be an effective tool in the utilization of these photographs. In this paper, a case study accident investigation is described where stereo photogrammetry was applied to develop information for further analysis and testing.