[Estimates are based on data from the 2002 and 1997 Commodity Flow Surveys. Because of rounding, estimates may not be additive]
|Mode of transportation||Value (percent)||Tons (percent)||Ton-miles (percent)|
|Air (includes truck and air)||0.2||1.6||–||–||–||–|
|Parcel, U.S.P.S. or courier||0.6||0.6||–||–||–||–|
|Other multiple modes||0.8||0.8||0.8||0.7||3.8||S|
|Other and unknown modes||0.9||1.7||0.6||1.1||0.7||0.6|
– Represents and 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.
1 "Truck" as a single mode includes shipments that were made by only private truck, only for-hire truck, or a combination of private and for-hire truck.
2 Estimates for pipeline exclude shipments of crude petroleum.
Bureau of Transportation Statistics (USDOT) and U.S. Census Bureau, 2002 Commodity Flow Survey, Hazmat Data, December 2004.