The Iowa DOT recently began construction of corridor improvements within the Council Bluffs Interstate System (CBIS). The multi-billion dollar construction program presents new challenges and warrants on-going effort to manage and streamline the construction process throughout the 18-mile corridor. One strategy employed by the program management team was the development of a regional, simulation-based, dynamic traffic assignment (DTA) model. The CBIS DTA model helps quantify construction impacts to user travel and identify efficiencies in phasing construction. This presentation will highlight 3 major elements of the model, which incorporates several elements of transportation planning and construction impact analysis into a single, cutting-edge tool. First, the CBIS model serves as a superior analysis tool for quantifying the impacts of work zones versus traditional methods because the model uses simulation procedures to precisely define the travel delay from the work zone, followed by DTA to allow vehicles to explore the possibility of using alternative routes to bypass the CBIS work zone completely. Second, the CBIS model does not just focus on the immediate limits of construction, but extends to include the entire City of Council Bluffs. The large geographic scale of the CBIS model allows the program management team to evaluate the full impact of freeway related closures, even on the local road system. Third, the CBIS DTA model was developed with the expectation that the model calibration would include both existing conditions and construction conditions calibration. This type of 2-part calibration is a major process improvement over standard model calibration because the calibration will fine tune the model in its reaction to variable conditions under actual construction conditions.