How does a rollover prevention system detect and prevent vehicle rollover?

Rollover prevention systems use roll angle, roll rate, lateral acceleration, and vehicle speed to calculate rollover propensity metrics (like TTR - Time To Rollover or RSC index). When thresholds are exceeded, the system intervenes by braking outside wheels to create counter-roll moment, reducing engine torque, and in advanced systems, activating active roll control. Algorithms distinguish between on-road maneuvers and off-road tripped rollovers. Integration with ESC prevents conflicts. Calibration uses handling tests, J-turn, and fishhook maneuvers, targeting intervention before 2/3 of critical roll angle while minimizing false activations.