Table 2a. Shipment Characteristics by Total Modal Activity for the United States: 2007
[Estimates are based on final data from the 2007 Commodity Flow Survey. Because of rounding, estimates may not be additive]
|Mode of transportation1||2007 Ton-miles2
|2007 Average miles per shipment||Ton-miles CV3||Average miles per shipment CV|
|Air (included truck and air)||4,425||1,080||9.6||2.5|
|Parcel, U.S.P.S. or courier||27,852||971||3.0||2.3|
|Other and unknown modes||33,510||112||9.3||12.7|
KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality.
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 Coefficient of Variation.
4 Estimates exclude shipments of crude petroleum.
NOTES: Value-of-shipment estimates are reported in current prices. Estimated measures of sampling variability for each estimate known as coefficients of variation (CV) are also provided in these tables. 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.