Creator
- United States. Bureau of Transportation Statistics[remove]7
- Battelle Memorial Institute1
- Environmental Systems Research Institute (Redlands, Calif.)1
- Jessberger, Steven1
- John A. Volpe National Transportation Systems Center (U.S.)1
- Miller, David1
- Strocko, Ed1
- United States. Federal Highway Administration1
- United States. Federal Highway Administration. Office of Highway Policy Information1