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An analysis of vehicle tip stability in NHTSA Side Impact New Car Assessment Program (SINCAP) tests was conducted in order to better understand the causes of possible tip-over in such a test, and the potential relationship to occupant safety. Analyses were conducted of accident data involving light passenger vehicle rollovers. SINCAP tests conducted at several facilities with SUV-type vehicles were reviewed. A computer simulation model of the SINCAP test was developed and used to analyze the effects on vehicle tip-over of variations in vehicle and test facility parameters. It was found that fatal accidents involving “multi-vehicle rollover” (ie, SINCAP like conditions) were the least frequent among four accident types examined; and that SUV’s had the lowest fatality rate in such accidents, among the four vehicle types examined.