Table B-19. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics of Temperature Controlled Shipments (1) 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 (2) |
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 | 8.9 | 0.0 | 7.8 | 0.0 | 6.1 | 0.0 | 10.1 |
| Single modes | 9.0 | 0.8 | 8.0 | 1.3 | 6.5 | 0.9 | 13.0 |
| Truck (3) | 13.0 | 3.5 | 10.6 | 2.9 | 9.1 | 4.2 | 11.2 |
| For-hire truck | 17.8 | 4.4 | 18.9 | 4.4 | 12.7 | 3.4 | 13.2 |
| Private truck | 8.0 | 2.2 | 7.0 | 3.0 | 10.3 | 1.8 | 8.0 |
| Rail | 12.4 | 2.9 | 9.5 | 2.2 | 11.4 | 4.3 | 9.5 |
| Water | 31.1 | 2.2 | 39.6 | 1.7 | 22.4 | 0.5 | S |
| Inland water | 31.4 | 2.1 | 41.8 | 1.7 | 20.4 | 0.5 | S |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Multiple waterways | S | S | S | S | S | S | S |
| Air (includes truck and air) | S | S | S | S | S | S | 13.4 |
| Pipeline (4) | 33.2 | 1.0 | 29.4 | 1.0 | S | S | S |
| Multiple modes | 29.2 | 0.8 | S | S | 25.6 | 0.9 | 19.1 |
| Parcel, U.S. Postal Service, or courier | 40.3 | 0.5 | 32.9 | Z | 32.2 | Z | 18.9 |
| Truck and rail | 31.7 | 0.2 | 28.2 | 0.3 | 28.0 | 0.8 | 34.8 |
| Truck and water | S | S | S | S | S | S | 44.4 |
| Rail and water | S | S | S | S | 48.0 | 2.2 | S |
| Other multiple modes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Other modes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
KEY: S = Withheld because estimate did not meet publication standards.
Z = Rounds to zero.
(1) Shipments that are temperature controlled are transported in a vehicle or container that regulates or maintains the temperature when en route to its destination.
(2) Ton-miles estimates are based on estimated distances traveled along a modeled transportation network. See “Mileage Calculations” section for additional information.
(3) “Truck” as a single mode includes shipments that were made by only private truck or only for-hire truck.
(4) 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/econ/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.