Method for controlling outflow of gas from an airbag includes deploying the airbag toward an occupant prior to or during an accident involving the vehicle, detecting contact between the airbag and the occupant by means of a sensor, and controlling outflow of gas from the airbag based on the detected contact. Contact between the airbag and the occupant may be detected by analyzing deceleration of the airbag, e.g., via an accelerometer arranged on a surface of the airbag, a pressure sensor arranged to sense the pressure in the airbag which is correlatable to the deceleration of the airbag and tension sensors arranged on tethers between opposed inner surfaces of the airbag. Outflow of fluid from the airbag may be controlled by arranging an exit control valve or vent in, on or in connection with the airbag and which is adjustable to provide variable outflows of gas from the airbag.