Appendix A: List of Acronyms, Abbreviations, and Initialisms


AAR: Association of American Railroads
ACS: American Communities Survey
ADA: Americans with Disabilities Act
ARRA: American Reinvestment and Recovery Act
ASCE: American Society of Civil Engineers


BAC: blood alcohol concentration
BEA: Bureau of Economic Analysis
BLS: Bureau of Labor Statistics
BTS: Bureau of Transportation Statistics
Btu: British thermal unit


CAFE: Corporate Average Fuel Economy
CBP: County Business Patterns
CES: Current Employment Statistics
CEX: Consumer Expenditure Survey
CFS: Commodity Flow Survey
C3RS: Confidential Close Calls Reporting System
CO: carbon monoxide
CO2 : carbon dioxide
CPI: Consumer Price Index


DOE: U.S. Department of Energy
DOT: U.S. Department of Transportation
dwt: deadweight tons


E85: ethanol 85%
EIA: Energy Information Administration
EPA: U.S. Environmental Protection Agency


FAA: Federal Aviation Administration
FAF: Freight Analysis Framework
FHWA: Federal Highway Administration
FMCSA: Federal Motor Carrier Safety Administration
FRA: Federal Railroad Administration
FTA: Federal Transit Administration
FTD: Foreign Trade Division
FY: fiscal year


GDP: Gross Domestic Product
GHG: greenhouse gas
GHSA: Governors Highway Safety Association
GPRA: Government Performance and Results Act
GVWR: gross vehicle weight rating


HMIS: Hazardous Materials Information System


ITA: International Trade Administration


MARAD: Maritime Administration
mpg: miles per gallon
mph: miles per hour


NAICS: North American Industry Classification System
NASA: National Aeronautics and Space Administration
NCFO: National Census of Ferry Operators
NHTS: National Household Travel Survey
NHTSA: National Highway Traffic Safety Administration
NIPA: National Income and Product Accounts
NOX: nitrogen oxides
NPIAS: National Plan of Integrated Airport Systems
NPTS: National Personal Transportation Survey
NRC: National Research Council
NTD: National Transit Database
NTL: National Transportation Library
NTS: National Transportation Statistics
NATS-OD: North American Transportation Statistics Online Database


OMB: Office of Management and Budget
ORNL: Oak Ridge National Laboratory


PM-2.5: particulate matter of 2.5 microns in diameter or smaller
PM-10: particulate matter of 10 microns in diameter or smaller
PMT: passenger-miles of travel


RITA: Research and Innovative Technology Administration
rpm: revenue passenger-mile


SOC: Standard Occupational Classification
SO2: sulfur dioxide
STOL: short take-off and landing
SUV: sport utility vehicle


TEU: 20-foot equivalent unit
TSAR: Transportation Statistics Annual Report
TRB: Transportation Research Board
TSI: Transportation Services Index
TTI: Texas Transportation Institute


USACE: U.S. Army Corps of Engineers
USCG: U.S. Coast Guard
USDA: U.S. Department of Agriculture
USDHS: U.S. Department of Homeland Security
USDOC: U.S. Department of Commerce
USDOE: U.S. Department of Energy
USDOL: U.S. Department of Labor
USDOT: U.S. Department of Transportation
USITC: U.S. International Trade Commission
UT: Unlinked Trips


VIUS: Vehicle Inventory and Use Survey
VMT: vehicle-miles of travel
VOC: volatile organic compounds