Tables 2-10 and 2-10M: U.S. Hazardous Materials Shipments by Transportation Mode: 1997

Flammable liquids, predominantly gasoline, are the major hazardous material transported in the United States. In terms of ton-miles, flammable liquids account for about 60 percent of total ton-miles of hazardous materials shipments. The next largest class of hazardous materials in ton-miles is corrosive materials (such as sodium hydroxide) at about 15 percent.

Table 2-10 (standard units)
Table in Excel format

Hazard class	Description	Value $ Billions	Value Percent	Tons Millions	Tons Percent	Ton-miles Millions	Ton-miles Percent
Class 1	Explosives	4.3	0.9	1.5	0.001	S	S
Class 2	Gases	40.9	8.8	115.0	7.3	21.8	8.3
Class 3	Flammable liquids	335.6	72.0	1,264.3	80.8	160.0	60.6
Class 4	Flammable solids	3.9	0.8	11.8	0.8	9.6	3.6
Class 5	Oxidizers and organic peroxides	4.5	1.0	9.2	0.6	4.5	1.7
Class 6	Toxics	10.1	2.2	6.4	0.4	2.8	1.1
Class 7	Radioactive materials	2.7	0.6	0.1	Z	0.05	Z
Class 8	Corrosive materials	40.4	8.7	91.6	5.9	41.2	15.6
Class 9	Miscellaneous dangerous goods	23.9	5.1	65.3	4.2	22.7	8.6
Total		466.4	100.0	1,565.2	100.0	263.8	100.0

Table 2-10M (metric units)
Table in Excel format

Hazard class	Description	Value $ Billions	Value Percent	Metric tonnes Millions	Metric tonnes Percent	Tonne-kilometers Billions	Tonne-kilometers Percent
Class 1	Explosives	4.3	0.9	1.4	0.1	S	S
Class 2	Gases	40.9	8.8	104.3	7.3	31.9	8.3
Class 3	Flammable liquids	335.6	72.0	1146.9	80.8	233.6	60.6
Class 4	Flammable solids	3.9	0.8	10.7	0.8	14.0	3.6
Class 5	Oxidizers and organic peroxides	4.5	1.0	8.4	0.6	6.5	1.7
Class 6	Toxics	10.1	2.2	5.8	0.4	4.1	1.1
Class 7	Radioactive materials	2.7	0.6	0.1	Z	0.05	Z
Class 8	Corrosive materials	40.4	8.7	83.1	5.9	60.1	15.6
Class 9	Miscellaneous dangerous goods	23.9	5.1	59.3	4.2	33.2	8.6
Total		466.4	100.0	1419.9	100.0	385.2	100.00

Key: S = data are not published because of high sampling variability or other reasons; Z = zero or less than 1 unit of measure.

Note: 1 ton = 0.91 metric tonne; 1 ton-mile = 1.46 tonne-kilometer.

Source: U.S. Department of Transportation, Bureau of Transportation Statistics and U.S. Department of Commerce, Census Bureau, 1997 Commodity Flow Survey, Hazardous Materials (Washington, DC: December 1999), table 2.