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Do you have an International Foot version of the "AASHTO Design Standards 2011.DGNLib" file? .
Yes, you can download the International Foot version of the 2011 design standards here:https://communities.bentley.com/products/road___site_design/m/road_and_site_design_gallery/270174/download.aspx
This file can then be copied to the "C:\ProgramData\Bentley\Civil\Standards\8.11.9\en\Design Standards" folder.