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This paper presents a new control mechanism based on a novel distinguished node (DN) model, for network topology and analysis in small-agent networks such as urban traffic network. The proposed DN model is represented by an extended direct graph that contains congregation and dispersing nodes, and main and connecting links. Both static and dynamic properties of the DN model are analyzed. With this new network model, a control mechanism is developed, which is governed by two heuristic rules of conflict avoidance and total delay minimization. A case study on a real urban traffic network is performed to demonstrate feasibility of the proposed DN model applied to the empirical networks, and verify the effectiveness of the proposed control mechanism.