| 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 Census1997 Commodity Flow Survey, Hazardous Materials (Washington, DC: December 1999), table 2.