An airbag is pushed in portions by at least one slide means into at least one compartment in order to generate the folding. The control unit provides local control and alarms, and also sends status reports andor alarms to a remote monitoring center via a telemetry device. The floor rail is connected in the region of the joint to an intermediate profile which is provided for interconnecting the mutually adjoining longitudinal sections of the floor rail in a flexurally rigid fashion. Alternatively, the chain itself carries at least one arbitrary substituent, or at least one compound forming or comprising such a nitroxyl radical of the formula is added to the polystyrene andor the melt thereof. The process may be repeated for a number of times. The exemplary method can then include distributing the prioritized first structural operation to all synced devices for execution.