Safety seat and method for reducing the passenger load of a motor vehicle

The method involves partially holding a seat surface unit (2) of a safety seat (1) over a strap tape (11). A take-up unit (27) is held at the strap tape, where the take-up unit shortens effective length of the strap tape and establishes bias force on the strap tape after the tape is lengthened under the load of force resulting from accident or explosion in a region of an extension portion (20) such that the effective length of the tape is ready to be lengthened by another application of force. The tape is connected between a back unit (3) of the seat and the seat surface unit. An independent claim is also included for a safety seat for a motor car.