Appendix A: List of Acronyms
Appendix A: List of Acronyms
AAR	Association of American Railroads 
ADA	Americans with Disabilities Act 
APTA	American Public Transportation Association 
ATPI	Air Travel Price Index 
ATTI	Air Travel Time Index 
ATTVI	Air Travel Time Variability Index 
BEA	Bureau of Economic Analysis 
BLS	Bureau of Labor Statistics 
BTS	Bureau of Transportation Statistics 
Btu	British thermal unit 
CBP	U.S. Customs and Border Protection 
CFS	Commodity Flow Survey 
CO	carbon monoxide 
CO2 carbon dioxide 
CPI	Consumer Price Index 
CPSC	Consumer Product Safety Commission 
DHS	U.S. Department of Homeland Security 
DOC	U.S. Department of Commerce 
DOE	U.S. Department of Energy 
DOL	U.S. Department of Labor 
DOT	U.S. Department of Transportation
dwt	deadweight tons 
EIA	Energy Information Administration 
EPA	U.S. Environmental Protection Agency 
FAA	Federal Aviation Administration 
FHWA	Federal Highway Administration 
FMCSA	Federal Motor Carrier Safety Administration 
FRA	Federal Railroad Administration 
FTA	Federal Transit Administration 
FY	fiscal year 
GDP	Gross Domestic Product 
GHG	greenhouse gas 
GIS	geographic information systems 
GVWR	gross vehicle weight rating 
HMIS Hazardous Materials Information System
ISTEA	Intermodal Surface Transportation Efficiency Act
ITS	intelligent transportation system 
MARAD	Maritime Administration 
MFP	multifactor productivity 
MISLE	Marine Information and Safety Law Enforcement 
mmtc	million metric tons of carbon 
mpg	miles per gallon 
mph	miles per hour 
MPO	metropolitan planning organization
MSA	metropolitan statistical area 
NAICS	North American Industry Classification System 
NEI	National Emissions Inventory 
NEISS	National Electronic Injury Surveillance System 
NHTS	National Household Travel Survey 
NHTSA	National Highway Traffic Safety Administration 
NOX nitrogen oxides 
NPIAS	National Plan of Integrated Airport Systems 
NTAD	National Transportation Atlas Database 
NTD	National Transit Database 
NTS National Transportation Statistics report 
NTSB	National Transportation Safety Board 
O&D	origin and destination 
OECD	Organization for Economic Cooperation and Development 
OOS	out of service 
OPEC	Organization of Petroleum Exporting Countries 
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 
quads quadrillions
RITA	Research and Innovative Technology Administration 
rpm	revenue passenger-mile 
SAFETEA-LU	Safe, Accountable, Flexible, Efficient Transportation Equity Act-A Legacy for Users 
SCTG	Standard Classification of Transported Goods 
SE	standard error 
SIC	Standard Industrial Classification 
STOL	short take-off and landing 
SUV	sport utility vehicle 
TEA-21	Transportation Equity Act for the 21st Century 
TEU	20-foot equivalent container unit 
TgCO2Eq	teragrams of carbon dioxide equivalent 
TSAR Transportation Statistics Annual Report 
TRB	Transportation Research Board 
TSI	Transportation Services Index 
TTI	Texas Transportation Institute 
TTI	Travel Time Index 
USACE U.S. Army Corps of Engineers USCG U.S. Coast Guard USDOT U.S. Department of Transportation
VIUS	Vehicle Inventory and Use Survey 
vmt	vehicle-miles of travel 
VOC	volatile organic compounds