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]
| 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.