Expressway networks undertake huge demands of urban travel, and its traffic condition directly influences the level of service of the urban road network. This study proposes the application of a simulation-based dynamic traffic assignment (DTA) model on Suzhou inner ring expressway network in China. The total length of the analyzed expressway network is 24.6 km with approximately 4,500 veh/h for each direction during peak hours in 2017. The model is implemented by DTALite, and the process of model building including data quality control, calibration of traffic flow parameters, time-dependent OD estimation, network preparation, model validity checking, and validation of model results. Validation results indicate that the DTA model can represent the time-dependent changing traffic conditions with acceptable accuracy. Results of the scenario test show that the model can represent and evaluate daily and special traffic conditions quantitatively and reliability.
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