|Mode||Value (percent)||Tons (percent)||Ton miles (percent)|
|Truck (for-hire, private, both)||71.2||69.4||53.1||58.3||24.4||27.9|
|Rail (includes truck and rail)||5.3||4.8||13.2||11.2||27.5||26.7|
|Parcel, postal, courier services||9.1||10.9||0.2||0.2||0.4||0.5|
|Air (includes truck and air)||2.2||2.7||0.0||0.0||0.1||0.2|
|Other and unknown modes||4.2||5.6||5.9||5.5||6.5||6.8|
|Total (domestic plus export shipments)||100.0||100.0||100.0||100.0||100.0||100.0|
SOURCES: U.S. Department of Transportation, Bureau of Transportation Statistics, based on U.S. Department of Commerce, Census Bureau, 1993 Commodity Flow Survey: United States, TC92-CF-52 (Washington, DC: 1995).
____. 1997 Commodity Flow Survey: United States Preliminary, EC97TCF-US(P) (Washington, DC: 1999).
Estimates for crude petroleum shipments by pipelines prepared for the Bureau of Transportation Statistics by Oak Ridge National Laboratory.