The invention relates to an air bag arrangement in vehicle, having a gas bag which, as the result of a triggering by a sensor, can be inflated with gas by a gas generator and, during the inflating, can be advanced into an interior of the vehicle, the gas generator having at least two driving stages with propellant charges which can be ignited in a time-related succession and of which the first propellant charge is ignited by a triggering by a sensor and the second propellant charge being ignited facultatively when the gas bag moves beyond a defined advancing position. In addition, the invention relates to a triggering process for an air bag arrangement, wherein, as a function of the driving situation, a first stage of at least one gas generator or at least a first gas generator is triggered, the gas generated in this manner is guided into at least one gas bag for its partial filling, at least one possible hindering of the expansion of the gas bag is detected, and in the case of an unhindered expansion of the gas bag at least one additional stage of the gas generator or at least one additional gas generator is triggered for the further or complete filling of the gas bag.