The highway input files are stored in the SERPM8\Inputs\Highway folder. Files with a scenario key are specified in the Cube Scenario Manager.
Note that the highway network files (*.NET) are created by exporting from a GeoDB network provided in the Inputs\GIS folder of the model catalog. The GeoDB includes multiple networks and represents the networks with curvature and GIS projections. However, a GeoDB can be more cumbersome to edit, therefore the Cube network (*.NET) file is used directly in the model. See the Highway Network page in the Application Guide for more information about working with shape files and when network edits should be made through the GeoDB.
Use the tab links at the bottom to switch to the input data dictionary of interest, or use the Google Sheets launch link at the top-right corner to open the entire spreadsheet for printing and/or download.