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This paper presents a Web-based DSS-decision support system - architecture for modeling, simulating and visualizing urban traffic. The architecture innovates by presenting a modeling of the problem that can be distributed and remotely updated by several users, and for using a mathematical model suitable for the Brazilian traffic reality. Moreover, it includes the usage of interactive graphical tools in order to produce visual results over maps. A prototype of the architecture was implemented. Evaluations carried out by specialists indicated that it can be useful for answering questions concerning urban traffic and urbanism.