[Estimates are shown as percents and are based on data from the 2002, 1997, and 1993 Commodity Flow Surveys]
|Mode of transportation||Ton-miles||Average miles per shipment (percent)|
|1997 to 2002||1993 to 2002||1997 to 2002||1993 to 2002|
|Parcel, U.S.P.S. or courier||1.2||0.5||0.7||0.4|
|Other and unknown modes||2.3||2.6||3.3||3.0|
– 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.