It is hoped that others within the accident reconstruction community will use Pycrash, make suggestions for its improvement and develop additional capabilities. The results indicate that Pycrash is well-equipped to perform fundamental accident reconstruction analyses, including impact related effects, but its simplified suspension model is a limitation. In this paper, the current capabilities of Pycrash are illustrated and its accuracy is assessed using matching PC-Crash simulations performed using PC-Crash. Pycrash is a free, open-source Python-based software package that, in its current state, can perform basic accident reconstruction calculations, automate data analyses, simulate single vehicle motion and, perform impulse-momentum based analyses of vehicle collisions. Purchased packages provide an improved interface and the ability to produce sophisticated animations of vehicle motion but can be cost prohibitive. These trajectories are incorporated into a three dimensional accident scene. Traffic accident animation provides a dynamic 3-D color visual portrayal of the time - speed - position histories of all vehicles and/or pedestrians. While there are a variety of software packages available to accident reconstructionists, many rely on custom spreadsheet-based applications for their analyses. Computer animations and simulations are effective tools in performing and presenting accident reconstruction analyses. Accident reconstructionists routinely rely on computer software to perform analyses. Crash data recorded in passenger vehicles and 18-wheelers is downloaded using a crash data retrieval tool to determine how the vehicle was operating before.
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