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This paper describes how a combined modeling and simulation study was successfully executed for the design of a toll plaza. As to the traffic congestion of toll plaza system, according to the input and output of the whole system, the authors develop an optimizing model for toll system-Black Box Model. This model is able to solve the problem and gain the optimization solution rapidly. Particular attention is paid to the toll plaza on Garden State Parkway (GSP), New Jersey, US. The authors use simulation in the toll system to compare and evaluate the model. The solution of the simulation experiment indicates that the result of the problem calculated by the Black Box Model is the optimal result conformed to the actual situation. Consequently, the optimization design of the toll plaza is obtained for GSP.