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An innovative approach that uses static origin-destination (O-D) matrices to model travel demand in dynamic urban traffic models is presented. Dynamic traffic assignment models require the use of time-dependent or dynamic O-D matrices whose acquisition and estimation can be costly and whose consistency can prove difficult to maintain, whereas static O-D matrices of overall trip demand have been estimated for various cities during the last decade. In contrast, the synthetic approach describes the user departure time behavior in a separate model that splits the demand specification into two distinct blocks: the departure time behavior and the time-independent trip demand. Pros and cons of this method are presented with an application to the Paris region with the dynamic simulator METROPOLIS. Guidelines for model designers and planners who are considering the shift to dynamic traffic simulation tools are also …