This report is the result of the efforts of many people. The Bottom Line Work Group, which is one of six work groups under the guidance of the AASHTO TEA-21 Reauthorization Steering Committee, prepared this report. A Bottom Line Advisory Committee, chaired by past AASHTO President E. Dean Carlson with members including several state department of transportation chief executive officers, provided oversight on behalf of the AASHTO Board of Directors. The work of the Bottom Line Work Group was supported by Alan E. Pisarski, who as a consultant to AASHTO provided valuable assistance in compiling and writing the document. Nancy Ross of the New York Department of Transportation, who chaired the Bottom Line Work Group, was instrumental in working with AASHTO staff, FHWA staff, consultants, and other state DOT representatives to lead this important effort, which has resulted in this significant input into the TEA-2 1 reauthorization process. Ron Epstein of New York DOT and his team are also to be recognized for their work, in cooperation with the American Public Transportation Association (APTA) and the Community Transportation Association of America (CTAA) in developing the transit component of the Bottom Line Report. Susan Binder, Ross Crichton and their colleagues at the Federal Highway Administration provided technical advice on the nature of the modeling, the interpretation of past results, and alternative scenarios. Richard Steinmann of the Federal Transit Administration provided similar assistance with comparable transit information.