HAZMAT Table 15b ,,,,,,
"Hazardous Material Shipment Characteristics for Packing Group I: Percent of Total for 2002 and 1997
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"[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]
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Description,Value (percent),,Tons (percent),,Ton—miles (percent),
,2002,1997,2002,1997,2002,1997
Total,100.0,100.0,100.0,100.0,100.0,100.0
Packing Group I,26.9,28.9,26.3,28.0,24.5,24.8
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KEY: 
— Represents an estimate equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards because of highly sampling variability or poor response quality.     
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NOTE:
Note: Packing Groups I, II, and III reflect the level of hazard associated with the material being shipped. Packing Group I is the most rigorous.",,,,,,
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SOURCE:
Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.      
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