Table 2c. Shipment Characteristics by Total Modal Activity for the United States: Percent of Total for 2007 and 2002

Table 2c. Shipment Characteristics by Total Modal Activity for the United States: Percent of Total for 2007 and 2002

[Estimates are based on data from the 2007 and 2002 Commodity Flow Surveys. Because of rounding, estimates may not be additive]

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Mode of transportation1 Ton-miles2 (percent) Ton-miles Standard Error %
2007 2002 2007 2002
Total 100 100 - -
Truck 40.4 40.2 1.3 1.5
Rail 46.3 43.4 2 1.6
Shallow draft 6.2 8.2 0.8 0.6
Great Lakes 0.9 1.6 0.3 0.3
Deep draft 2.8 2.4 0.4 0.4
Air 0.1 0.2 - -
Parcel, U.S.P.S. or courier 0.8 0.6 - -
Pipeline3 S S S S
Other and unknown modes 1 1.4 0.1 0.2

KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality. - = Zero or Less than half the unit shown; thus, it has been rounded to zero.

1 Estimates represent activity for a given mode across single and multiple mode shipments. For example, "Truck" ton-miles includes total ton-miles for shipments moving only by truck plus ton-miles for truck segments of multiple mode shipments.
2 Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
3 Estimates exclude shipments of crude petroleum (SCTG 16).

NOTES: Value-of-shipment estimates are reported in current prices. More information on sampling error, confidentiality protection, nonsampling error, sample design, and definitions may be found at http://www.bts.gov/cfs.

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2007 Economic Census: Transportation Commodity Flow Survey, December 2009.