Describes: - the general requirements for the design of transport labels containing linear bar code and two-dimensional symbols for use by a wide range of industries; - traceability of transported units via a unique transport unit identifier code or 'licence plate', and supplemented where necessary by other identified data presented both in bar code and human readable form; - a choice of linear bar code and two-dimensional symbologies; - quality requirements, classes of bar code density; and - recommendations as to label material, size and the inclusion of free text and any appropriate graphics.