Bureau of Transportation Statistics (BTS)
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Table 2
Hazardous Materials Shipments by Class and Miles Shipped: 1997

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Class Averagemiles per shipment
Flammable solids 838
Explosives 549
Radioactive materials 445
Toxics (poison) 402
Corrosive materials 201
Oxidizers/organic peroxides 193
Flammable liquids 73
Gases 66
Miscellaneous dangerous goods 323
Weighted average 113

SOURCE: U.S. Department of Commerce, Census Bureau, 1997 Economic Census—1997 Commodity Flow Survey, Hazardous Materials (Washington, DC: December 1999), table 2.