Ms. Heffron managed the original Container Terminal Access Study that evaluated all modes of travel to and from the Port of Seattle's container terminals in Seattle's Duwamish Industrial Area. Measures to improve truck access to the interstates, reduce dray movements between the container terminals and the railroad intermodal yards, and accommodate on-dock intermodal facilities were evaluated. Most of the improvement recommendations from the original study have been constructed. Heffron Transportation updated this study to reflect current conditions in year 2003 and projections for the year 2013. The updated study set forth a new list of transportation improvement projects for the Port of Seattle to pursue over the following decade.