The information contained in this report was collected through interviews with State GIS specialists and project managers who manage GIS4EST work. With consultation from FHWA, eight geographically diverse States were selected for interviews. The GIS applications developed by these States represent the full spectrum of GIS development. The GIS applications that State DOT officials described fall into four general categories of use: * Data management; * Interagency coordination; * Spatial analysis and modeling; and * Re-engineering business processes. While state DOTs vary in the process by which they adopt and apply GIS4EST technologies, these categories suggest a rough sequencing for the development of a GIS4EST application from less to more complex systems. These applications are discussed, grouped by the phase of development that best describes their GIS4EST efforts to date.