HAZMAT Table B–2a,,,,,,,
"Estimated Measures of Reliability for Hazardous Material Shipment Characteristics by Hazard Class: 2002
",,,,,,,
"[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
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Hazard class and description,"
Value",,Tons,,Ton-miles,,"CV of Average miles 
per shipment"
, CV , Std. error of percent , CV , Std. error of percent , CV , Std. error of percent ,
Total, 3.0 ,   — , 4.2 ,   — , 4.4 ,   — , 7.1 
"Class 1, Explosives", 23.8 , 0.3 , 43.2 ,   — , 29.5 , 0.1 , 10.9 
"Class 2, Gases", 7.9 , 0.8 , 15.6 , 1.1 , 8.9 , 0.9 , 29.0 
"Class 3, Flammable liquids", 3.7 , 1.4 , 4.3 , 1.4 , 5.2 , 1.6 , 12.2 
"Class 4, Flammable solids", 22.1 , 0.2 , 8.8 ,   — , 14.0 , 0.2 , 46.3 
"Class 5, Oxidizers and organic peroxides", 21.8 , 0.2 , 26.8 , 0.2 , 25.3 , 0.3 , 18.7 
"Class 6, Toxic (poison)", 11.6 , 0.2 , 15.9 ,   — , 22.2 , 0.3 , 21.3 
"Class 7, Radioactive materials", 39.0 , 0.3 , 31.2 ,   — , 31.7 ,   — , S 
"Class 8, Corrosive materials", 6.9 , 0.5 , 9.7 , 0.6 , 10.1 , 1.1 , 14.9 
"Class 9, Miscellaneous dangerous goods", 13.4 , 0.5 , 20.6 , 0.6 , 11.8 , 0.7 , 9.3 
"
KEY: 
— Represents and estimate equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards b ecause of highly sampling variability or poor response quality.
CV Coefficient of variation of number",,,,,,,
"NOTE: The Introduction and appendixes give information on confidentiality protection, sampling error, nonsampling error, sample design, and definitions. Links to this information on the Internet may be found at www.census.gov/cfs.",,,,,,,
"SOURCE:  Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.",,,,,,,