American Association of State Highway and Transportation Officials (AASHTO)
 American Automobile Association
 American Public Transportation Association
 Association of American Railroads
 California Air Resources Board
 California Energy Commission
 East Tennessee Clean Fuels Coalition (ETCFC)
 FEDSTATS
 Intergovernmental Panel on Climate Change
 ITS America
 ITS Deployment Tracking Survey Website
 National Safety Council
 National Transportation Research Center (NTRC)
 Oak Ridge National Laboratory
   • Engineering Science and Technology Division
   • ORNL Review
   • ORNL Waterways Program: A New Generation of Models & Assessment Tools
 Transportation Research Board (TRB)
 U.S. Army Corps of Engineers
 U.S. Bureau of Labor Statistics
 U.S. Department of Commerce
   • Bureau of Economic Analysis
   • Bureau of the Census
      ° Vehicle Inventory and Use Survey

 U.S. Department of Energy
   • Office of Energy Efficiency and Renewable Energy
       ° Vehicle Technologies Program
       ° Hydrogen, Fuel Cells & Infrastructure Technologies Program
   • Alternative Fuels & Advanced Vehicles Data Center
   • Clean Cities
   • Fuel Economy Web Site
   • Energy Information Administration
 U.S. Department of Transportation
   • Federal Highway Administration
      ° Office of Highway Policy Information
           › 2001 National Household Travel Survey
           › 1995 Nationwide Personal Transportation Survey
   • Federal Aviation Administration
   • Bureau of Transportation Statistics
      ° Commodity Flow Survey Program
   • National Highway Traffic Safety Administration
   • Office of Defects Investigation
   • Transportation Security Administration (TSA)
   • U.S. Coast Guard
   • Volpe Transportation Systems Center
 U.S. Environmental Protection Agency
   • Office of Air and Radiation
   • Office of Air Quality Planning & Standards
   • Office of Transportation and Air Quality
   • Fuel Economy Web Site