In the preparation of the Environmental Impact Statement for the Upgrade of Elizabeth Drive and the Overview Report on the Western Sydney Orbital, a number of traffic and transport investigations were done. This report presents the wide focus of those technical investigations and puts them into a single volume. This is a collaborative work of separate research tasks undertaken to support the detail of the Environmental Impact Statement and the broad regional scope of the Overview Report. The drawing of conclusions and relationships is generally the province of the final reports, with this material providing the technical base.