Volpe National Transportation Systems Center, Technical Reference Center;BTS Productshttps://doi.org/10.21949/15234301978PDFStatistical ReportGay, William F.John A. Volpe National Transportation Systems Center (U.S.)United States. Department of Transportation. Office of the SecretaryUnited States. Dept. of Transportation. Research and Special Programs AdministrationUnited StatesTransportationTrend (Statistics)Operating costsRevenuesCostsTransportation modesEnergy consumptionNTSDOT-TSC-OST-77-68National Transportation Statistics was formed by the union of: United States. Department of Transportation. Office of the Assistant Secretary for Policy, Plans, and International Affairs. Summary of national transportation statistics; and: Energy stat...