ISO 5422:1982 Preview
Road vehicles -- Anchorages for towing ropes, cables or bars
Specifies the characteristics of the towing anchorages mounted on road vehicles, allowing them to be towed or to tow another vehicle. Applies to passenger cars as defined in ISO 3833 and to other vehicles which have a maximum authorized total weight not exceeding 3,5 tonnes. The shape of the anchorages is left to the manufacturer's option.