A side impact restraint protection system (S) for a vehicle (V), comprising a first side safety structure , a second side safety structure , a first structural element of a vehicle body structure of the vehicle (V), 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 (V) and the second side safety structure is arranged in connection to a second side door of the vehicle (V), 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 (V), 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 (V) and the second side safety structure is arranged in connection to a second side door of the vehicle (V), 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 (V), 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. <EOS>