| AAR |
Association of American
Railroads |
| ATA |
American Trucking Association |
| BEA |
Bureau of Economic Analysis |
| BTS |
Bureau of Transportation Statistics |
| CB |
U.S. Census Bureau |
| CBP |
U.S. Customs and Border Protection |
| dwt |
deadweight tons |
| FHWA |
Federal Highway Administration |
| FRA |
Federal Railroad Administration |
| GAO |
U.S. Government Accountability Offi ce |
| GDP |
gross domestic product |
| HTS |
harmonized tariff schedule |
| ICC |
International Chamber of Commerce |
| JOC |
Journal of Commerce |
| MARAD |
Maritime Administration |
| NCHRP |
National Cooperative Highway Research Program |
| NRC |
National Research Council |
| PIERS |
Port Import and Export Reporting Service |
| RITA |
Research and Innovative Technology Administration |
| TEU |
twenty-foot equivalent container unit |
| TRB |
Transportation Research Board |
| TSA |
Transportation Security Administration |
| TSI |
Transportation Services Index |
| TTI |
Texas Transportation Institute |
| TWIC |
Transportation Worker Identification Credential |
| USCG |
U.S. Coast Guard |
| USDHS |
U.S. Department of Homeland Security |
| USDOC |
U.S. Department of Commerce |
| USDOE |
U.S. Department of Energy |
| USDOT |
U.S. Department of Transportation |
