This depends on the definition of bicycle accident reconstruction. In auto collisions and even single-vehicle accidents, it is often possible to determine, with quite good reliability, the movements of the vehicles concerned. When an attorney involved in a bicycle accident case asks for "accident reconstruction" he is likely to assume that degree of accuracy and reliability can be provided. Unfortunately, that is not so. There is copious information on mass, inertia, deformation, and such for a wide range of motor vehicles, information that can enable good determinations. However, for a bicycle accident 3/4 to 4/5 of the mass of the "vehicle" is in the cyclist, and the cyclist is a collection of loosely jointed masses under a degree of control that is largely unpredictable. Therefore, reconstruction beyond the initial movements is most uncertain.

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