A side impact restraint protection system for a vehicle includes first and second side safety structures and first and second structural elements of a vehicle body structure. The first and second side safety structures are respectively connected to a first side door and a second side door. The first and second side doors are arranged to cover a common single door opening of the vehicle body structure. The first structural element is in a position in front of the door opening and the second structural element is in a position behind the door opening in a longitudinal direction. In the closed door position, the first and second side safety structures are releasably connected to each other via a connecting device, and the first and second side safety structures are respectively connected to the first and second structural elements via a first connection member and a second connection member.

A safety release system releases a connection between a side safety structure and a connecting device of a side impact restraint protection system for a vehicle after an impact event. The side safety structure is connected to a side door, and the safety release system enables opening of the side door after the impact event, wherein the safety release system is arranged between the side safety structure and the connecting device. The connecting device releasably attaches the side safety structure to a side impact restraint protection system member connected to a vehicle body structure. The safety release system includes a releasing mechanism and a releasing member detachable from each other, and the safety release system has a first state where the releasing mechanism and the releasing member are connected to each other and a second state where the releasing mechanism and the releasing member are disconnected from each other.