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Table 3-4 Hazardous Materials Shipments by Hazard Class: 2007 and 2012


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Hazard class Description Value ($ billions) Tons (millions) Ton-miles1 Average distance per shipment (miles)
2007 2012 2007 2012 2007 2012 2007 2012
Class 1 Explosives 11.8 18.4 3.0 4.0 0.9 1.0 738 840
Class 2 Gases 131.8 125.1 250.5 164.8 55.3 33.2 51 57
Class 3 Flammable liquids 1,170.5 2,016.7 1,752.8 2,203.5 181.6 204.6 91 93
Class 4 Flammable solids 4.1 5.4 20.4 11.3 5.5 5.8 309 565
Class 5 Oxidizers and organic peroxides 6.7 7.6 15.0 12.0 7.0 5.5 361 437
Class 6 Toxic (poison) 21.2 15.2 11.3 7.6 5.7 3.6 467 513
Class 7 Radioactive materials 20.6 12.3 0.5 S Z 0.4 S 34
Class 8 Corrosive materials 51.5 75.9 114.4 125.3 44.4 37.8 208 264
Class 9 Miscellaneous dangerous goods 30.1 58.0 63.2 51.0 23.0 16.1 484 530
Total   1,448.2 2,334.4 2,231.1 2,580.2 323.5 307.5 96 114

KEY: S = data are not published because estimate did not meet publication standards. By far, the most common reason for suppressing a cell is a high coefficient of variation (greater than 50 percent).; Z = rounds to zero.

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

NOTE: Value-of-shipments estimates have not been adjusted for price changes. Numbers and percents may not add to totals due to rounding.

SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, Census Bureau, 2012 Commodity Flow Survey, Hazardous Materials (Washington, DC: February 2015), table 2b, available at www.bts.gov/publications/commodity_flow_survey/ as of March 2016.

Updated: Saturday, May 20, 2017