Table 1c. Hazardous Material Shipment Characteristics by Mode of Transportation: Percent of Total for 2007 and 2002
Estimates are based on data from the 2007 and 2002 Commodity Flow Surveys. Because of rounding, estimates may not be additive.
|Mode of transportation||Value (percent)||Tons (percent)||Ton-miles (percent) 1||Value Standard Error of %||Tons Standard Error of %||Ton-miles Standard Error of %|
|Air (incl truck and air)||0.1||0.2||S||-||S||-||0.1||-||S||-||S||-|
|Parcel, U.S.P.S. or courier||0.5||0.6||-||-||-||-||0.1||0.1||-||-||-||-|
|Truck and rail||0.5||-||0.5||-||3.1||-||0.1||-||0.1||-||0.5||-|
|Truck and water||1.6||-||1.6||-||3.8||-||0.3||-||0.3||-||0.7||-|
|Rail and water||0.4||-||0.3||-||0.9||-||0.1||-||0.1||-||0.2||-|
|Other multiple modes 4||1.9||0.8||2.5||0.8||5.3||3.8||0.4||0.2||0.5||0.2||1.2||0.9|
|Other and unknown modes||0.5||0.9||0.4||0.6||0.5||0.7||-||0.2||-||0.1||0.1||0.4|
KEY: S = Estimate does not meet publication standards because of high sampling variability or poor response quality. - = Zero or Less than half the unit shown; thus, it has been rounded to zero.
1 Ton-miles estimates are based on
estimated distances traveled along a modeled transportation network.
2 "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.
3 Estimates for pipeline exclude shipments of crude petroleum.
4 The 2007 and 2002 "Other multiple modes" categories are not directly comparable due to a definition change. For 2002, "Other multiple modes" includes shipments using "Trucks and rail", "Truck and water", "Rail and water", and other mode combinations not specifically listed. For 2007, "Truck and rail", "Truck and water", and "Rail and water" are not part of "Other multiple modes".
NOTES: Value-of-shipment estimates are reported in current prices. More information on sampling error, confidentiality protection, nonsampling error, sample design, and definitions may be found at http://www.bts.gov/publications/commodity_flow_survey/.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, U.S. Census Bureau, 2007 Economic Census: Transportation Commodity Flow Survey, December 2009.