 Part 2, covering top tether anchorages was published in December 2004.Amendments to include Isofix in United Nations Economic Commission for Europe (UNECE) vehicle regulations 14 and 44, which specify uniform provisions for the design of vehicle seat anchorages and child safety seats, came into force for signatory countries in February 2004.Under the current UN/ECE R14, all new vehicles produced since February 2013 are required to have Isofix lower anchorages and top tether attachments.