Table 2a. Hazardous Material Shipment Characteristics by Hazard Class: 2007

Table 2a. Hazardous Material Shipment Characteristics by Hazard Class: 2007

Estimates are based on data from the 2007 Commodity Flow Survey. Because of rounding, estimates may not be additive.

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Hazard class and description Value Tons Ton-miles 1 Average miles
per shipment
Value Tons Ton-miles Average miles per shipment CV
2007
(million $)
Percent 2007
(thousands)
Percent 2007
(millions)
Percent CV 2 Standard Error of % CV Standard Error of % CV Standard Error of %
Total 1,448,218 100 2,231,133 100 323,457 100 96 2.6 - 3.3 - 4.6 - 8.1
Class 1, Explosives 11,754 0.8 3,047 0.1 911 0.3 738 17.6 0.2 14.1 - 13 - 8.7
Class 2, Gases 131,810 9.1 250,506 11.2 55,260 17.1 51 9.2 0.8 8.5 0.9 12.8 1.8 10.7
Class 3, Flammable liquids 1,170,455 80.8 1,752,814 78.6 181,615 56.1 91 3.3 1.2 3.3 1.1 2.7 2 18.6
Class 4, Flammable solids 4,067 0.3 20,408 0.9 5,547 1.7 309 22.2 0.1 20.9 0.2 21.1 0.3 18.1
Class 5, Oxidizers and organic peroxides 6,695 0.5 14,959 0.7 7,024 2.2 361 10.6 - 15 0.1 18.9 0.4 9.8
Class 6, Toxic (poison) 21,198 1.5 11,270 0.5 5,667 1.8 467 22 0.4 13.9 0.1 15.7 0.4 14.7
Class 7, Radioactive materials 20,633 1.4 515 - 37 - S 25.7 0.3 35.8 - 24 - S
Class 8, Corrosive materials 51,475 3.6 114,441 5.1 44,395 13.7 208 5.9 0.2 9.4 0.4 16.1 1.7 14.3
Class 9, Miscellaneous dangerous goods 30,131 2.1 63,173 2.8 23,002 7.1 484 10.5 0.2 9.7 0.2 12.5 0.8 16.3

KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality. - = Zero or Less than half the unit shown; thus, it has been rounded to zero.

1 Ton-miles estimates are based on estimated distances traveled along a modeled transportation network.
2 Coefficient of Variation.

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/publications/commodity_flow_survey/.

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.