Using data collected from his inspections, Nathan Rose used an accident analysis software package called PC-Crash to simulate the subject collision. PC-Crash utilizes physics-based equations to calculate the motion of vehicles caused by driver steering, braking, and acceleration inputs, or by collision forces. The software allows the analyst to specify the vehicle and scene geometries and the roadway surface conditions, and then to simulate the motion of the vehicles. This software package is commonly and widely utilized by accident reconstructionists, law enforcement offices, insurance companies, the automotive industry, and universities to analyze vehicular collisions. The software has been validated for accident reconstruction and subjected to peer review and publication. PC-Crash has also been widely utilized and accepted in previous legal matters involving vehicular collisions. The North American distributors of PC-Crash (MEA Forensic) have compiled a list of more than 200 instances of PC-Crash being admitted for use in expert testimony in court proceedings.
Through PC-Crash, Mr. Rose was able to determine that the actual speed of the Honda was approximately 41 mph at the time of the crash, and the speed of the Chevrolet was approximately 14 mph. Based on the speed of the SUV and the placement of the tractor trailer, Mr. Rose was able to determine the events that led to the impact.