Table B-6. Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class and Mode of Transportation: 2012
Monday, July 13, 2015
(Estimates are based on data from the 2012 Commodity Flow Survey)
| Hazard class and mode of transportation | Value | Tons | Ton-miles (1) |
Average miles per shipment — coefficient of variation of number |
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|---|---|---|---|---|---|---|---|
| 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 | ||
| Class 1, Explosives | |||||||
| All modes | 17.6 | 0.0 | 21.7 | 0.0 | 13.5 | 0.0 | 3.7 |
| Single modes | 19.3 | 2.5 | 22.1 | 0.8 | 15.1 | 1.6 | 14.0 |
| Truck (2) | 20.5 | 3.6 | 22.3 | 1.1 | 15.5 | 2.2 | 15.3 |
| For-hire truck | 24.7 | 4.5 | 18.4 | 8.3 | 14.3 | 3.4 | 9.5 |
| Private truck | 23.3 | 4.2 | 31.7 | 8.8 | 25.9 | 4.3 | 24.9 |
| Rail | S | S | 41.6 | 2.3 | S | S | S |
| Water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Inland water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Air (includes truck and air) | S | S | 34.8 | 0.1 | 32.9 | 0.6 | 8.3 |
| Pipeline (3) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Multiple modes | 16.7 | 2.5 | 13.3 | 0.8 | 14.1 | 1.6 | 4.8 |
| Parcel, U.S. Postal Service, or courier | 18.1 | 2.1 | 14.1 | 0.5 | 14.1 | 1.2 | 4.7 |
| Truck and rail | 24.1 | 0.9 | 28.0 | 0.6 | 22.9 | 1.1 | 23.9 |
| Truck and water | S | S | S | S | S | S | S |
| Rail and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 |
| Class 2, Gases | |||||||
| All modes | 5.6 | 0.0 | 4.9 | 0.0 | 9.9 | 0.0 | 10.0 |
| Single modes | 5.6 | 0.5 | 4.9 | 0.2 | 9.8 | 0.4 | 7.5 |
| Truck (2) | 6.8 | 1.8 | 6.9 | 1.6 | 10.1 | 2.8 | 7.0 |
| For-hire truck | 17.7 | 2.7 | 9.1 | 1.1 | 16.3 | 2.4 | 24.5 |
| Private truck | 7.0 | 2.2 | 8.2 | 2.0 | 11.6 | 2.3 | 10.7 |
| Rail | 14.6 | 1.1 | 9.8 | 0.9 | 17.2 | 4.0 | 7.8 |
| Water | 21.5 | 1.9 | 18.5 | 1.6 | 34.6 | 3.1 | 34.8 |
| Inland water | 33.9 | 2.1 | 32.0 | 2.0 | 47.5 | 3.3 | 37.1 |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | S | S | S | S | 42.3 | 0.6 | S |
| Multiple waterways | 30.1 | 2.7 | 48.4 | 2.4 | 49.7 | 3.1 | 0.8 |
| Air (includes truck and air) | S | S | S | S | S | S | 9.8 |
| Pipeline (3) | 12.5 | 1.8 | 7.9 | 1.0 | S | S | S |
| Multiple modes | 22.8 | 0.5 | 22.3 | 0.2 | 21.2 | 0.4 | 18.9 |
| Parcel, U.S. Postal Service, or courier | 32.6 | 0.5 | 24.3 | Z | 33.2 | Z | 19.0 |
| Truck and rail | 25.8 | 0.1 | 21.5 | 0.1 | 21.8 | 0.4 | S |
| Truck and water | S | S | S | S | S | S | 33.6 |
| Rail and water | S | S | S | S | S | S | 6.6 |
| 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 |
| Class 3, Flammable and combustible liquid | |||||||
| All modes | 3.6 | 0.0 | 4.1 | 0.0 | 8.1 | 0.0 | 9.3 |
| Single modes | 3.7 | 0.3 | 4.1 | 0.4 | 8.8 | 4.9 | 6.1 |
| Truck (2) | 4.3 | 2.0 | 4.1 | 2.5 | 9.0 | 2.0 | 7.2 |
| For-hire truck | 5.1 | 2.4 | 5.7 | 2.7 | 6.8 | 1.5 | 8.2 |
| Private truck | 8.6 | 1.3 | 8.5 | 1.4 | 14.6 | 1.2 | 10.4 |
| Rail | 12.2 | 0.2 | 11.6 | 0.2 | 14.4 | 2.2 | 4.7 |
| Water | 25.6 | 2.3 | 31.3 | 2.9 | 19.5 | 3.7 | 17.0 |
| Inland water | 27.5 | 1.9 | 34.3 | 2.6 | 31.5 | 3.1 | S |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | 39.6 | 0.6 | 39.7 | 0.7 | 39.2 | 3.0 | 20.9 |
| Multiple waterways | 46.0 | 0.4 | 44.1 | 0.4 | 45.1 | 3.3 | 46.7 |
| Air (includes truck and air) | 33.5 | Z | S | S | 42.2 | Z | 10.6 |
| Pipeline (3) | 9.7 | 2.2 | 12.0 | 2.7 | S | S | S |
| Multiple modes | 29.8 | 0.3 | 37.5 | 0.4 | S | S | 7.3 |
| Parcel, U.S. Postal Service, or courier | 16.4 | Z | 20.1 | Z | 27.5 | Z | 7.6 |
| Truck and rail | 20.1 | 0.1 | 18.0 | 0.1 | 15.7 | 1.1 | 6.8 |
| Truck and water | S | S | S | S | S | S | S |
| Rail and water | 39.6 | 0.1 | S | S | 37.2 | 0.4 | 39.8 |
| 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 |
| Class 4, Flammable solid; spontaneously combustible material; dangerous when wet material | |||||||
| All modes | 14.2 | 0.0 | 13.7 | 0.0 | 28.5 | 0.0 | 24.7 |
| Single modes | 14.6 | 1.7 | 13.7 | 0.1 | 29.0 | 1.3 | 21.3 |
| Truck (2) | 14.8 | 6.7 | 13.4 | 4.0 | 20.6 | 7.1 | 10.5 |
| For-hire truck | 9.4 | 6.0 | 13.4 | 3.7 | 20.9 | 7.1 | 13.3 |
| Private truck | 41.4 | 4.4 | 21.5 | 1.7 | 34.0 | 0.4 | 18.0 |
| Rail | 31.1 | 5.6 | 24.6 | 5.1 | 33.5 | 8.1 | 17.5 |
| Water | S | S | S | S | 32.6 | 2.1 | 37.0 |
| Inland water | S | S | S | S | 36.9 | 3.1 | 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 | 20.8 |
| Pipeline (3) | S | S | S | S | S | S | S |
| Multiple modes | 38.0 | 1.7 | 33.3 | 0.1 | 36.0 | 1.3 | 49.4 |
| Parcel, U.S. Postal Service, or courier | S | S | S | S | S | S | 42.2 |
| Truck and rail | 29.2 | 0.6 | 32.8 | 0.2 | 33.1 | 1.6 | 4.0 |
| Truck and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Rail and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 |
| Class 5, Oxidizers and organic peroxides | |||||||
| All modes | 9.3 | 0.0 | 10.3 | 0.0 | 17.5 | 0.0 | 11.5 |
| Single modes | 9.4 | 0.8 | 10.7 | 0.9 | 18.1 | 1.6 | 17.8 |
| Truck (2) | 12.2 | 5.6 | 9.1 | 5.8 | 15.4 | 5.9 | 19.3 |
| For-hire truck | 13.6 | 5.1 | 14.0 | 4.4 | 17.2 | 5.0 | 11.5 |
| Private truck | 29.0 | 5.8 | 10.8 | 3.7 | 17.1 | 1.8 | 18.4 |
| Rail | 30.2 | 5.8 | 25.0 | 6.0 | 25.6 | 6.9 | 9.8 |
| Water | S | S | S | S | S | S | S |
| Inland water | S | S | S | S | S | S | S |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | S | S | S | S | S | S | S |
| Multiple waterways | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Air (includes truck and air) | S | S | 39.6 | Z | S | S | S |
| Pipeline (3) | 16.6 | 0.7 | 16.7 | 1.6 | S | S | S |
| Multiple modes | 27.3 | 0.8 | 41.9 | 0.9 | 28.8 | 1.6 | 20.9 |
| Parcel, U.S. Postal Service, or courier | 38.4 | 0.3 | S | S | S | S | 23.6 |
| Truck and rail | 38.0 | 1.0 | 41.5 | 1.3 | 32.4 | 1.8 | 35.6 |
| Truck and water | S | S | S | S | S | S | S |
| Rail and water | 4.1 | 0.2 | 3.7 | 0.5 | 3.7 | 6.5 | 0.0 |
| 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 |
| Class 6, Toxic materials and infectious substances | |||||||
| All modes | 14.6 | 0.0 | 28.4 | 0.0 | 23.3 | 0.0 | 10.2 |
| Single modes | 15.8 | 4.0 | 28.5 | 0.2 | 23.5 | 1.3 | 11.6 |
| Truck (2) | 10.3 | 6.3 | 18.3 | 10.1 | 21.4 | 8.4 | 15.7 |
| For-hire truck | 17.0 | 6.1 | 19.2 | 8.0 | 23.7 | 7.6 | 15.4 |
| Private truck | 22.9 | 4.3 | 39.3 | 4.2 | 25.5 | 1.0 | 15.5 |
| Rail | 27.8 | 4.2 | 28.7 | 5.1 | 22.6 | 4.1 | 15.2 |
| Water | 38.1 | 5.8 | 40.9 | 9.7 | 41.6 | 6.4 | 27.5 |
| Inland water | 38.1 | 5.8 | 40.9 | 9.7 | 41.6 | 6.4 | 27.5 |
| 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Air (includes truck and air) | 25.7 | 0.7 | S | S | S | S | 8.0 |
| Pipeline (3) | S | S | S | S | S | S | S |
| Multiple modes | S | S | 26.9 | 0.2 | 34.4 | 1.3 | 30.7 |
| Parcel, U.S. Postal Service, or courier | S | S | 40.6 | 0.1 | 40.1 | 0.1 | 30.7 |
| Truck and rail | 32.0 | 0.3 | 26.2 | 0.6 | 30.7 | 3.5 | 43.1 |
| Truck and water | S | S | S | S | S | S | S |
| Rail and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 |
| Class 7, Radioactive material | |||||||
| All modes | 34.5 | 0.0 | S | S | 35.7 | 0.0 | 36.3 |
| Single modes | 36.3 | 3.3 | S | S | 38.1 | 6.7 | 48.1 |
| Truck (2) | 37.9 | 4.0 | S | S | 39.7 | 7.4 | 18.3 |
| For-hire truck | 32.6 | 10.7 | 30.8 | 6.1 | S | S | 33.7 |
| Private truck | S | S | S | S | S | S | 16.4 |
| Rail | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Inland water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Air (includes truck and air) | S | S | S | S | S | S | 36.7 |
| Pipeline (3) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Multiple modes | 21.8 | 3.3 | 29.4 | 5.0 | 27.5 | 6.7 | S |
| Parcel, U.S. Postal Service, or courier | 21.8 | 3.3 | 29.4 | 5.0 | 27.5 | 6.7 | S |
| Truck and rail | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Truck and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Rail and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 |
| Class 8, Corrosive material | |||||||
| All modes | 6.3 | 0.0 | 8.0 | 0.0 | 9.1 | 0.0 | 14.0 |
| Single modes | 6.5 | 0.5 | 8.0 | 0.2 | 9.0 | 1.0 | 13.5 |
| Truck (2) | 8.6 | 3.1 | 10.4 | 4.2 | 8.5 | 3.8 | 12.8 |
| For-hire truck | 7.0 | 2.1 | 9.4 | 1.7 | 8.1 | 3.0 | 10.4 |
| Private truck | 13.2 | 3.5 | 15.3 | 3.6 | 17.6 | 1.5 | 7.9 |
| Rail | 14.1 | 2.7 | 12.0 | 2.3 | 12.2 | 3.0 | 7.1 |
| Water | 24.1 | 0.7 | 32.0 | 3.3 | 23.1 | 2.1 | 17.6 |
| Inland water | 25.0 | 0.7 | 34.3 | 3.4 | 20.3 | 2.0 | 35.1 |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | S | S | S | S | S | S | S |
| Multiple waterways | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Air (includes truck and air) | 48.8 | 0.2 | S | S | S | S | 5.4 |
| Pipeline (3) | 33.4 | 0.5 | 38.5 | 2.0 | S | S | S |
| Multiple modes | 16.3 | 0.5 | 26.1 | 0.2 | 25.3 | 1.0 | 9.3 |
| Parcel, U.S. Postal Service, or courier | 13.9 | 0.3 | 31.2 | Z | 24.3 | Z | 9.7 |
| Truck and rail | 30.9 | 0.4 | 29.3 | 0.2 | 30.9 | 1.0 | 13.0 |
| Truck and water | 33.3 | 0.1 | 33.9 | Z | 38.9 | 0.3 | 21.6 |
| Rail and water | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| 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 |
| Class 9, Miscellaneous hazardous material | |||||||
| All modes | 9.4 | 0.0 | 17.2 | 0.0 | 12.7 | 0.0 | 19.4 |
| Single modes | 9.4 | 1.2 | 18.0 | 2.9 | 13.1 | 1.1 | 18.3 |
| Truck (2) | 8.2 | 3.2 | 20.3 | 4.5 | 14.5 | 4.2 | 20.5 |
| For-hire truck | 10.9 | 4.0 | 25.2 | 5.5 | 16.9 | 4.0 | 19.8 |
| Private truck | 13.8 | 2.1 | 12.8 | 2.1 | 11.3 | 0.8 | 9.3 |
| Rail | 18.8 | 2.6 | 16.1 | 3.6 | 15.7 | 4.9 | 10.7 |
| Water | S | S | 39.9 | 1.9 | 34.2 | 1.5 | 31.6 |
| Inland water | S | S | 43.1 | 1.5 | 35.6 | 1.4 | 32.7 |
| Great Lakes | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Deep sea | S | S | S | S | S | S | S |
| Multiple waterways | S | S | S | S | S | S | S |
| Air (includes truck and air) | 28.8 | 0.4 | 22.2 | Z | 38.8 | Z | 14.1 |
| Pipeline (3) | S | S | S | S | S | S | S |
| Multiple modes | 26.9 | 1.2 | S | S | 21.9 | 1.1 | 19.8 |
| Parcel, U.S. Postal Service, or courier | 35.9 | 0.7 | 33.3 | Z | 26.6 | Z | 20.0 |
| Truck and rail | 29.8 | 0.6 | 22.4 | 0.2 | 21.8 | 0.8 | 20.9 |
| Truck and water | S | S | S | S | S | S | 34.5 |
| Rail and water | S | S | S | S | 48.0 | 4.9 | 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) 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.