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A description of a complex reality in a simplified form, which can be used in research, constitutes the basic purpose of modelling. A system of city logistics interpreted as a system of elements involved in the flow of people, freight and information in urbanized areas is such a complex picture in urbanized areas. In the modelling process of the system of city logistics, mathematical modelling was used, which consists in the creation of mathematical models of the systems analysed and further in the use of the mathematical apparatus on the stage of experimenting with these models. The article includes the presentation of a model of city logistics together with one of the most important assessment criteria of the model presented of urbanized areas that are essential to users, i.e. travelling costs. This quantity reflects subjective perception of the nuisance of travelling in the urban reality. A reference was made to travelling costs, where the total generalized travel costs and the total external travel costs were determined as components.
Keywords: City logistics, model of city logistics, travel costs© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.