Abstract: This type of rollover protection system typically comprises a roll bar body that is either firmly anchored to the vehicle, or is displaceably guided in a guide element that is fixed to the vehicle, in conjunction with a locking device that serves as a retraction blocking mechanism to lock the deployed roll bar body against any unintended retraction. To structurally control high peak loads that occur in a rollover without a total failure of the protective system, particularly of the locking device in deployable systems, the invention provides that the roll bar body, possibly the associated guide element and its fixation on the vehicle as well as the retraction blocking mechanism be configured as a rigid system relative to the maximum load that occurs in a rollover. A cross-member-type support element terminating the roll bar body on the end face is configured as a predetermined deformation point for a limited defined deformation path in load direction for energy degradation.