The clock begins ticking on a Nov. 15 deadline for public comment about dynamic test procedures to predict vehicle rollover propensity. Following months of sometimes heated debate, during which the National Highway Traffic Safety Admin. (NHTSA) was urged to consider factors from tire temperature to test-driver skill, two proposed methodologies have emerged: Closed-loop maneuvers where all test vehicles follow the same path. Open-loop maneuvers where all test vehicles are ...

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