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A new method for computer-based photogrammetry in accident reconstruction is presented. CAD software is used to produce three-dimensional models of the site, vehicles, and other objects important in the incident. Objects of known configuration are incorporated into the scene model, and a perspective view is created that corresponds to the photograph. Then the objects of unknown position are added, and these are translated and rotated until they match the photograph. The result is a three-dimensional computer model of the site geometry, from which positional information may be extracted by examining the top, front, and side orthographic views.

The results of an empirical study of the dynamic conditions necessary for non-intrusive, plastic deformation of automotive lamp filaments is presented. Both barrier impact and centrifugal techniques were utilized to inertially load the lamp filaments. Numerous tests were conducted under a variety of filament illumination combinations in order to determine threshold values of acceleration necessary for permanent, plastic filament deformation. The study revealed that acceleration levels necessary for permanent filament deformation are well in excess of the average values of deceleration experienced by an automobile, even in very high speed collisions.