ISO11154-4:2004 establishes technical specifications for the magnetic fixing devices of roof load carriers and specifies the minimum safety requirements, and test methods, for such devices, thus offering the occupants of those vehicles on which the carriers are mounted, as well as other road users and pedestrians, a minimum level of safety when the devices are used in accordance with the manufacturer's instructions. It is applicable to magnetic fixing devices suitable for carrying a defined load and intended for mounting on or above the roofs of passenger cars and light commercial vehicles having a maximum authorized total mass of up to 3,5 t.