Further occupant protection items included two-stage airbags for driver and front passenger, head-thorax airbags in the doors, integral seats, high-performance emergency tensioning retractors, belt force limiters and the sensor-controlled rollbar, which also went into action when the Vario roof was closed. The most recent SL model series (R 231) has been available since 2012. The new generation featuring a technical and visual facelift is to be launched in April 2016, sporting an even more dynamic design. In evolving the radiator grille, for example, the designers have drawn inspiration from the SL’s earliest forebears. Powerful engines, the 9G-TRONIC automatic transmission, DYNAMIC SELECT with five transmission modes and Active Body Control with curve tilting function raise the roadster to a new level of driving comfort and sportiness. The soft top, which can now be operated at up to 40 km/h, and the automatic boot separator are additional amenities which further enhance the convenient user-friendliness of this luxury sports car.