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There is presented a software toolkit for urban traffic simulation. The advantages of the toolkit are defined by using software implementation based on a web-oriented approach that does not require the installation of any programs as well as high-performance hardware. In order to increase the modeling efficiency, the toolkit uses layers: road network elements are placed on the first unchanged static layer; vehicles are placed on the second dynamic layer. Vehicles are redrawn at each modeling step; the road network is redrawn on demand. The software toolkit is based on SUMO traffic flow simulator by TraCI protocol for data transfer. The paper describes a component and structural diagrams of toolkit architecture and contains developed data processing algorithms. The technique of hardware optimization required for traffic modeling is implemented through the use of design patterns. The graphical user interface of the toolkit for changing modeling parameters during the simulation is presented. Modeling on a section of the road network of Samara, Russia was carried out. Based on the results of this modeling, restrictions are imposed on the size of the simulated road network and on the number of vehicles: total area of road network should not exceed 3 square km, while the number of road network elements should not exceed 10000, the total number of vehicles should not exceed 5000.