"Table 1-57: U.S. Hazardous Materials Shipments by Hazard Class, 2002",,,,,,,
,Value,,Tons,,Ton-miles,,Average miles per shipment
Hazard class and description,($ billion),Percent,(millions),Percent,(billions),Percent,
Class 1.  Explosives, 7.9 ,1.2, 5.0 ,0.2, 1.6 ,0.5, 651 
Class 2.  Gases, 73.9 ,11.2, 213.4 ,9.7, 37.3 ,11.4, 95 
Class 3.  Flammable liquids, 490.2 ,74.3," 1,789.0 ",81.6, 218.6 ,66.9, 106 
Class 4.  Flammable solids, 6.6 ,1.0, 11.3 ,0.5, 4.4 ,1.3, 158 
Class 5.  Oxidizers and organic peroxides, 5.5 ,0.8, 12.7 ,0.6, 4.2 ,1.3, 407 
Class 6.  Toxics (poison), 8.3 ,1.3, 8.5 ,0.4, 4.3 ,1.3, 626 
Class 7.  Radioactive materials, 5.9 ,0.9, 0.1 ,?, ? ,?, S 
Class 8.  Corrosive materials, 38.3 ,5.8, 90.7 ,4.1, 36.3 ,11.1, 301 
Class 9.  Miscellaneous dangerous goods, 23.6 ,3.6, 61.0 ,2.8, 20.2 ,6.2, 368 
Total, 660.2 ,100.0," 2,191.5 ",100.0, 326.7 ,100.0, 136 
KEY: ? = less than 1 unit of measure or rounds to zero; S = data were not published because of high sampling variability or other reasons.,,,,,,,
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NOTE,,,,,,,
Numbers may not add to totals due to rounding.,,,,
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SOURCE,,,,
"U.S. Department of Transportation, Bureau of Transportation Statistics, U.S. Department of Commerce, Census Bureau, 2002 Economic Census, Transportation, 2002 Commodity Flow Survey, Hazardous Materials (Washington, DC:  December 2004), table 2a. ",,,,