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O’Neill et al (1996) compared CRASH3 delta-V estimates with impact speed in 41 frontal offset barrier crash tests, and found that CRASH3 produced a delta-V estimate that was approximately 33% less than the impact speed of the collision. Their study concluded that CRASH3 underestimated delta-V by approximately 10% on average, and exhibited a fair amount of scatter surrounding that average. Smith and Noga (1982) reconstructed 27 vehicle-to-vehicle crash tests using CRASH3, and compared the results with the delta-V measured by crash test instrumentation. the National Automotive Sampling System/Crashworthiness Data System (NASS/CDS).Ĭomputation of delta-V using WinSmash and other derivatives of the CRASH3 code is not always successful or accurate. Delta-V is a crucial component of accident reconstruction, and is widely used as a measure of crash severity in crash statistics databases, e.g. THE WINSMASH COMPUTER CODE estimates vehicle change in velocity, or delta-V, based on post-crash measurements of vehicle deformation. After adjusting for restitution, WinSmash underestimated delta-V in frontal crashes by only 1% on average. The single most important factor in improving WinSmash accuracy was the inclusion of restitution. The use of vehicle-specific stiffness coefficients improved the accuracy of the longitudinal delta-V estimate. WinSmash underestimated delta-V for pickup trucks by only 3%, but underestimated delta-V for front-wheel drive cars by 31%. When using categorical stiffness coefficients, the accuracy of delta-V estimates was found to be a strong function of vehicle type. WinSmash was found to be most accurate in crashes involving full frontal engagement of the vehicle structure. WinSmash was found to underestimate delta-V by 23% on average. The accuracy of WinSmash delta-V estimates was evaluated for 121 NASS/CDS 2000–2003 cases for which direct measurements of delta-V had been retrieved from an Event Data Recorder on the case vehicle. The objective of this paper is to investigate the accuracy of WinSmash delta-V estimates as a function of crash mode, vehicle body type, and vehicle stiffness.