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Estimation of operating cost, fuel consumption and pollutant emissions for evaluating intersection and mid-block traffic conditions is useful for design, operations and planning purposes in traffic management. This paper describes the method to model operating cost, fuel consumption and emissions (CO2, CO, HC, NOx) in the aaSIDRA intersection analysis and aaMOTION trip/drive-cycle simulator software packages developed by Akcelik & Associates. aaSIDRA is an intersection analysis package first released in 1984. The latest version is aaSIDRA 2.0 (Akcelik & Associates 2002). aaMOTION for general traffic assessment purposes is a single-vehicle microscopic simulation package that uses a time-step simulation model. It has not been released yet. aaSIDRA uses a four-mode elemental model to estimate fuel consumption and pollutant emissions. The operating cost includes the direct vehicle operating cost …