The goal of this thesis is to create a city traffic simulator, which visualizes its results on a web interface. Information about the traffic network is obtained from the OpenStreetMap project. The simulation is based on a microscopic model and focuses mainly on the Brno - Střed area. Vehicles are modeled as separate entities that communicate with each other and follow the traffic rules. The thesis describes the basic principles of traffic modeling and simulation. It also deals with some existing microscopic traffic simulators and their properties. The second part of the thesis describes the design and implementation of the created application. It focuses mainly on the description of OpenStreetMap data processing, vehicle model, structure o...