The ongoing Ford Motor Co. and Bridgestone/Firestone Inc. tire recall has the National Highway Traffic Safety Admin. (NHTSA) primed to issue rollover ratings on new cars and trucks by year-end. To determine a vehicle's propensity to roll, the agency developed a mathematical formula known as Static Stability Factor (SSF), which can be converted to the well-known star safety rating system. NHTSA did not develop the SSF in response to the Firestone recall and concern over sport/utility ...

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