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 %|
|Parcel, U.S.P.S. or courier||0.8||0.6||-||-|
|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.