The article analyzes scientific works aimed at improving the efficiency of urban passenger transport systems, its results are presented. The importance of the structural parameters of the rolling stock as an element determining the quality and efficiency of the transport process is noted. In terms of the development of existing developments, a set of methods is proposed that allow mathematical modeling of passenger flows of urban passenger transport routes and indicators of the efficiency of servicing these routes by a fleet with specified structural parameters. Based on the simulation results, the areas of effective use of various types of transport and categories of vehicles are determined. The obtained data can be used as initial information in determining the optimal structural parameters of the fleet of vehicles serving urban passenger routes.
 Purpose – improving the efficiency of the urban passenger transport complex on the basis of optimizing the structural parameters of the fleet of vehicles.
 Methodology: during the research, the following methods were used: theory of technical operation of cars; methods of technical and economic analysis; theory of operational properties of cars; probability theory; methods of mathematical analysis; theory of management of socio-technical systems.
 Results: a set of interrelated methods has been developed that allow to simulate passenger flows of urban passenger routes and determine key performance indicators for the operation of various modes of transport and categories of vehicles. The values of annual traffic volumes determining the areas of their effective application are determined.
 Practical implications: research and practical activities in the field of organization of public transport services by urban passenger public transport.