US Table B–2e,,,
"Estimated Standard Errors for Shipment Characteristics by Total Modal Activity for the United States: Percent of Total for 2002, 1997, and 1993",,,
"
[Estimates are shown as percents and are based on data from the 2002, 1997, and 1993 Commodity Flow Surveys]",,,
Mode of transportation,"
Ton-miles (percent)",,
,2002,1997,1993
Total,—,—,—
Truck,1.5,1.1,0.9
Rail,1.6,1.5,0.9
Shallow draft,0.6,0.4,1.0
Great Lakes,0.3,0.2,0.3
Deep draft,0.4,0.5,0.5
Air,—,—,—
"Parcel, U.S.P.S. or courier",—,—,—
Pipeline,S,S,S
Other and unknown modes,0.2,0.3,0.5
"KEY: 
— Represents data cell equal to zero or less than 1 unit of measure.  
S Estimate does not meet publication standards because of high sampling variability or poor response quality.",,,
"NOTES: 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, United States Data, December 2004.",,,
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