In the 911 Carrera Cabriolet models, an automatically deploying roll-over protection system offers added protection if the car were to overturn. Two spring-loaded roll-over bars are neatly incorporated behind the rear seats. The roll-over sensor continuously monitors the car’s pitch and roll, contact with the road, as well as lateral and longitudinal forces. The instant a potential roll-over is detected, it initiates deployment of the roll-over bars within fractions of a second. For the 911 Targa 4 and 911 Targa 4S, added roll-over safety is provided by a steel protection system concealed behind the aluminium trim of the Targa roll bar.