TRB's National Cooperative Highway Research Program (NCHRP) Report 677: Development of Levels of Service for the Interstate Highway System examines a level-of-service-based approach to describing the performance of Interstate Highway System (IHS) assets. The report also includes a template and process that state departments of transportation (DOTs) may use to implement this approach for managing their IHS assets. The appendices to NCHRP Report 677 were published on a CD-ROM that is included with the report. Titles of the appendices are as follows: Appendix A: State-of-the-Practice Research; Appendix B: Development of Levels of Service for the IHS. The CD-ROM is also available for download from TRB's website as an ISO image.