In this analysis, it will be used as a comparative measure aimed at discerning rollover crash attributes and associated injury vulnerabilities. Based on previous reporting, the unbelted occupant is the most vulnerable to ejection and fatality; however, even the belted occupant is at risk because some current seatbelts, and most retractors, are primarily designed to withstand the exigencies imposed by a planar crash. Further, the complexity of the rollover crash suggests that vehicle integrity, in particular roof strength, in conjunction with, restraint use must provide adequate protection to minimize occupant injury. The concern is accentuated by recent roof crush testing (Federal Highway Administration, Test 03005 A&B, 2003) in which each roof strike appeared to weaken the loading capacity of the roof. The examination of the most frequently occurring types of rollover crashes and their associated injury outcomes in relation to quarter turns, as reported in real-world data bases, is proposed to further understand rollover crashes.

Under the circumstances encountered during a rollover crash, occupant vulnerability increased with the omission of restraint use. For those completely ejected, 97 percent were unrestrained. Among injured occupants, the proportion of serious injuries was greater for those involved in rollover crashes.