This International Standard. specifies the minimum requirements for the design of labels containing linear bar code and twodimensionalsymbols on transport units to convey data between trading partners;. provides for traceability of transported units via a unique transport unit identifier (licence plate);. provides guidance for the formatting on the label of data presented in linear bar code, twodimensional symbol or human readable form;. provides specific recommendations regarding the choice of bar code symbologies, specifies qualityrequirements, classes of bar code density;. makes recommendations as to label placement, size and the inclusion of free text a