There are a few main causes of rollovers. After a vehicle is hit, or when drivers swerve to avoid an obstacle, or simply due to poor road conditions, a vehicle can slide sideways and hit an object, such as a curb, that can trip the tire and cause the vehicle to roll over.
Taller vehicles such as SUVs and vans are more prone to rollovers due to their high center of gravity. Also, when defective tires blow out, drivers can lose control of their vehicles and that can cause a vehicle to roll over.