HAZMAT Table B–4 ,,,,,,,,,,
"Estimated Measures of Reliability for Hazardous Versus Nonhazardous Material Shipment Characteristics by Mode of Transportation: 2002
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"[Estimates are shown as percents and are based on data from the 2002 Commodity Flow Survey]
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Mode of transportation,Tons ,,,,,Ton–miles,,,,
,CV,Hazardous,,Nonhazardous,,CV,Hazardous,,Nonhazardous,
,,CV,Std. error of percent,CV,Std. error of percent,,CV,Std. error of percent,CV,Std. error of percent
All modes,1.1,4.2,0.7,1.3,0.7,3.2,4.4,0.5,3.4,0.5
Single modes,1.4,4.2,0.7,1.5,0.7,3.0,4.9,0.5,3.2,0.5
Truck,1.9,4.6,0.7,2.2,0.7,3.2,7.0,0.5,3.1,0.5
For—hire truck ,3.8,6.2,0.7,4.2,0.7,3.6,9.4,0.6,3.5,0.6
Private truck,2.3,5.3,0.7,2.2,0.7,3.9,7.9,0.8,3.6,0.8
Rail,3.3,6.6,0.4,3.4,0.4,6.6,5.8,0.4,6.9,0.4
Water,8.5,14.3,3.2,8.7,3.2,8.0,12.0,3.0,10.1,3.0
Air (includes truck and air),12.7,38.0,0.5,12.5,0.5,17.4,39.2,0.5,17.3,0.5
Pipeline,6.8,7.0,0.5,15.0,0.5,S,S,S,S,S
Multiple modes,8.1,24.3,1.8,8.5,1.8,13.6,19.9,1.3,14.9,1.3
"Parcel, U.S.P.S. or courier",4.8,20.2,0.2,4.9,0.2,4.9,13.0,—,4.9,—
Other multiple modes,9.3,24.7,2.1,10.0,2.1,14.9,20.1,1.5,16.4,1.5
Other and unknown modes,12.9,19.0,1.1,13.4,1.1,10.5,46.0,1.7,9.8,1.7
"
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. 
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.",,,,,,,,,,