This chart helps consumers make comparisons across vehicle classes. The information is based on data from all vehicles tested under NHTSA’s 2001-2003 rollover resistance ratings system (Static Stability Factor, SSF, only). For example, the passenger cars that were tested have 4- or 5-star ratings, and an average chance of rollover of approximately 12% if involved in a single-vehicle crash. The range for passenger cars is approximately 6% to 19%.