Table B-1b. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Mode of Transportation for the United States: 2012 and 2007
(Estimates are based on data from the 2012 and 2007 Commodity Flow Surveys)
Mode of transportation | Value | Tons | Ton-miles (1) | Average miles per shipment | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Coefficient of variation of number | Standard error of percent change | Coefficient of variation of number | Standard error of percent change | Coefficient of variation of number | Standard error of percent change | Coefficient of variation of number | Standard error of percent change | |||||
2012 | 2007 | 2012 | 2007 | 2012 | 2007 | 2012 | 2007 | |||||
All modes | 3.1 | 2.6 | 6.5 | 3.7 | 3.3 | 5.8 | 6.2 | 4.6 | 7.4 | 7.8 | 8.1 | 13.4 |
Single modes | 3.1 | 2.4 | 6.6 | 3.7 | 3.2 | 5.9 | 6.0 | 4.1 | 7.2 | 7.4 | 8.6 | 11.9 |
Truck (2) | 3.6 | 3.4 | 8.7 | 3.7 | 5.4 | 8.3 | 6.0 | 6.5 | 8.2 | 6.2 | 9.4 | 10.8 |
For-hire truck | 4.5 | 5.9 | 17.9 | 4.9 | 6.5 | 14.6 | 5.0 | 8.2 | 9.4 | 8.3 | 20.1 | 15.2 |
Private truck | 7.6 | 5.5 | 11.7 | 7.5 | 7.4 | 9.6 | 11.2 | 9.3 | 12.3 | 9.1 | 4.5 | 10.3 |
Rail | 7.7 | 8.2 | 12.9 | 6.2 | 10.4 | 10.3 | 6.9 | 8.0 | 9.7 | 2.9 | 11.2 | 16.1 |
Water | 24.3 | 15.9 | 91.2 | 28.2 | 13.3 | 59.0 | 17.4 | 15.2 | 34.2 | 15.6 | 22.8 | 15.3 |
Inland water | 26.3 | 19.0 | 97.0 | 30.6 | 16.1 | 62.9 | 28.7 | 26.3 | 48.0 | S | S | S |
Great Lakes | 0.0 | S | S | 0.0 | S | S | 0.0 | S | S | 0.0 | S | S |
Deep sea | 38.0 | 13.2 | 123.1 | 36.9 | 13.8 | 73.4 | 36.7 | 23.2 | 57.9 | 25.7 | 16.5 | 30.3 |
Multiple waterways | 44.0 | X | X | 42.7 | X | X | 43.8 | X | X | S | X | X |
Air (includes truck and air) | 12.8 | 34.9 | 93.9 | 29.3 | S | S | 38.4 | S | S | 8.7 | 7.5 | 11.8 |
Pipeline (3) | 9.3 | 5.7 | 15.0 | 11.0 | 5.3 | 12.2 | S | S | S | S | S | S |
Multiple modes | 15.6 | 12.5 | 8.4 | 30.9 | 13.5 | 8.3 | 45.8 | 14.4 | 35.7 | 6.2 | 5.4 | 6.4 |
Parcel, U.S. Postal Service, or courier | 11.0 | 19.4 | 30.0 | 9.0 | 16.7 | 24.5 | 10.4 | 28.9 | 36.2 | 6.2 | 5.6 | 6.5 |
Truck and rail | 14.5 | 16.8 | 42.0 | 15.6 | 16.2 | 32.7 | 14.0 | 18.2 | 37.7 | 9.2 | 11.2 | 17.8 |
Truck and water | S | 24.8 | S | S | 23.5 | S | S | 20.1 | S | 14.1 | 28.4 | 37.1 |
Rail and water | 30.6 | 20.4 | 17.7 | 42.5 | 19.1 | 37.3 | 33.3 | 24.1 | 19.3 | S | 22.6 | S |
Other multiple modes | 0.0 | 20.3 | 0.0 | 0.0 | 19.9 | 0.0 | 0.0 | 25.6 | 0.0 | 0.0 | 13.8 | 0.0 |
Other modes | 0.0 | 9.2 | 0.0 | 0.0 | 10.8 | 0.0 | 0.0 | 24.6 | 0.0 | 0.0 | 26.8 | 0.0 |
KEY: S = Withheld because estimate did not meet publication standards.
X = Not applicable.
(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/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.