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The question is: whether the system total travel cost and travel time are reduced by adjusting the work start time or not? This paper proposes the two-level model for answering the question; the upper-level minimizes the system travel cost and travel time by using the work start time as a decision variable, the lower-level models the stochastic dynamic simultaneous route/departure time equilibrium problem. Finally, numerical results of a small network are provided to illustrate the behavior of the model.