Table B-1a. Estimated Measures of Reliability for Shipment Characteristics by Mode of Transportation for the United States: 2012
(Estimates are based on data from the 2012 Commodity Flow Survey)
| Mode of transportation | Value | Tons | Ton-miles (1) |
Average miles per shipment — coefficient of variation of number |
|||
|---|---|---|---|---|---|---|---|
| Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | Coefficient of variation of number | Standard error of percent of total | ||
| All modes | 1.1 | 0.0 | 1.8 | 0.0 | 3.7 | 0.0 | 3.4 |
| Single modes | 1.2 | 0.2 | 1.8 | 0.2 | 4.4 | 0.9 | 3.5 |
| Truck (2) | 1.1 | 0.4 | 1.5 | 1.0 | 1.6 | 1.2 | 4.1 |
| For-hire truck | 0.8 | 0.3 | 2.1 | 0.8 | 1.6 | 1.2 | 4.3 |
| Private truck | 1.8 | 0.3 | 1.4 | 0.4 | 3.4 | 0.1 | 16.4 |
| Rail | 5.4 | 0.2 | 8.0 | 1.0 | 9.1 | 2.3 | 2.7 |
| Water | 16.5 | 0.3 | 13.2 | 0.6 | 14.9 | 1.0 | 12.9 |
| Inland water | 19.9 | 0.3 | 16.4 | 0.6 | 17.3 | 0.7 | 21.3 |
| Great Lakes | 25.0 | Z | 19.5 | 0.1 | 23.3 | 0.1 | 7.9 |
| Deep sea | 23.5 | 0.1 | 25.2 | 0.2 | 30.1 | 0.2 | 10.4 |
| Multiple waterways | 32.9 | 0.1 | 25.8 | 0.1 | 22.9 | 0.3 | 10.5 |
| Air (includes truck and air) | 4.5 | 0.1 | 7.2 | Z | 13.4 | Z | 8.8 |
| Pipeline (3) | 9.3 | 0.4 | 11.0 | 0.6 | S | S | S |
| Multiple modes | 1.3 | 0.2 | 7.0 | 0.2 | 7.1 | 0.9 | 2.6 |
| Parcel, U.S. Postal Service, or courier | 1.4 | 0.2 | 3.0 | Z | 2.6 | Z | 2.6 |
| Truck and rail | 5.5 | 0.1 | 7.2 | 0.1 | 5.7 | 0.4 | 6.0 |
| Truck and water | 15.4 | Z | 22.7 | 0.1 | 38.5 | 0.7 | 7.3 |
| Rail and water | 13.0 | Z | 20.1 | 0.1 | 26.2 | 0.3 | 25.6 |
| Other multiple modes | 33.3 | Z | 36.6 | Z | 32.2 | Z | S |
| Other modes | 31.8 | Z | 18.1 | 0.1 | 22.7 | Z | S |
KEY: S = Withheld because estimate did not meet publication standards.
Z = Rounds to zero.
(1) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.
(2) “Truck” as a single mode includes shipments that were made by only private truck or only for-hire truck.
(3) Estimates for pipeline exclude shipments of crude petroleum (SCTG 16).
NOTES: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design and definitions. Links to this information on the Internet may be found at <www.census.gov/cfs>.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2012 Economic Census: Transportation Commodity Flow Survey, December 2014.