A side impact restraint protection system for a vehicle, comprising a first side safety structure, a second side safety structure, a first structural element of a vehicle body structure of the vehicle, and a second structural element of the vehicle body structure, wherein the first side safety structure is arranged in connection to a first side door of the vehicle and the second side safety structure is arranged in connection to a second side door of the vehicle, wherein the first side door and the second side door are arranged to cover a common single door opening of the vehicle body structure in a closed door position (Pc), wherein the first structural element is arranged in a position in front of the door opening in a longitudinal direction (D LO) of the vehicle, and the second structural element arranged in a position behind the door opening in the longitudinal direction (D LO), wherein in the closed door position (P C) the first side safety structure and the second side safety structure are configured to be releasably connected to each other via a connecting device, the first side safety structure is configured to be connected to the first structural element via a first connection member, and the second side safety structure is configured to be connected to the second structural element via a second connection member, characterized in that the first side safety structure is connected to the connecting device via a safety release system (S R), wherein the safety release system (S R) is arranged between the first side safety structure and the connecting device, wherein the safety release system (S R) is configured for releasing a connection between the first side safety structure and the connecting device after a vehicle impact event. wherein the first side safety structure is arranged in connection to a first side door of the vehicle and the second side safety structure is arranged in connection to a second side door of the vehicle, wherein the first side door and the second side door are arranged to cover a common single door opening of the vehicle body structure in a closed door position (Pc), wherein the first structural element is arranged in a position in front of the door opening in a longitudinal direction (D LO) of the vehicle, and the second structural element arranged in a position behind the door opening in the longitudinal direction (D LO), wherein in the closed door position (P C) the first side safety structure and the second side safety structure are configured to be releasably connected to each other via a connecting device, the first side safety structure is configured to be connected to the first structural element via a first connection member, and the second side safety structure is configured to be connected to the second structural element via a second connection member, characterized in that the first side safety structure is connected to the connecting device via a safety release system (S R), wherein the safety release system (S R) is arranged between the first side safety structure and the connecting device, wherein the safety release system (S R) is configured for releasing a connection between the first side safety structure and the connecting device after a vehicle impact event.