Rollover crashes account for 12% of all people killed on roads and a disproportionately high 24% of vehicle occupants are killed in vehicles that roll over. Rollovers also account for around 17% of all spinal injuries. This project will focus on establishing which combination of vehicle rollover crash severity, roll kinematics, biomechanical injury criteria, crash test dummy, and restraint systems, address the major proportion of rollover fatalities and serious injuries. The research team will also determine which vehicle components (roof strength, roof geometry, restraint systems, air curtains, etc), or combination thereof, provide the most effective, practical, and cost efficient rollover injury mitigation strategies for regulators, industry and consumers to consider and adopt.