Included with the Driver Assistance Package is another Mercedes-Benz safety breakthrough. PRE-SAFEŽ is a predictive occupant-protection system that helps prepare for an accident in the critical moments before it occurs. If sensors detect certain vehicle movements that indicate that an accident is possible, PRE-SAFE takes action: Reversible electronic tensioners tighten the seat belts. The occupied front passenger seat adjusts to a more favorable position for air-bag and seat-belt effectiveness, while both active front head restraints adjust for optimum protection. If severe skidding indicates that a rollover is likely, PRE-SAFE closes the side windows. If no accident occurs, the seat-belt tensioners reverse, and you simply readjust your seat, open the windows and continue on your way.