Summaries and Analysis
Iowa Department of Transportation
Federal Highway Administration
Federal Highway Administration - MAP-21 information (summary, legislation, funding tables, program fact sheets and frequently asked questions)
Federal Transit Administration
Federal Transit Administration - MAP-21 information (code changes and funding information, program fact sheets, and frequently asked questions)
Federal Motor Carrier Safety Administration
American Association of State Highway Transportation Officials
American Association of State Highway Transportation Officials MAP-21 Resource Center (bill summary and text, SAFETEA-LU vs. MAP-21, AASHTO analysis)
Other
American Association of Motor Vehicle Administrators section-by-section analysis