Millions of tons
|Air (includes truck and air)||7||10||10|
|Other and unknown modes||541||440||499|
|Commodity Flow Survey||9,688||11,090||11,573|
|Percentage of total||72.5||74.7||73.2|
|Percentage of total||27.5||25.3||26.8|
NOTES: 2002 Commodity Flow Survey and supplemental data are preliminary. Multimodal includes the traditional intermodal combination of truck and rail plus truck and water; rail and water; parcel, postal, and courier service; and other multiple modes for the same shipment. Supplemental estimates cover logging, farm-based truck shipments, truck imports from Canada and Mexico, rail imports from Canada and Mexico, air cargo imports and exports, water imports and exports, and pipeline crude and petroleum products shipments. These estimates exclude other supplemental categories of goods movement for which no reasonable basis for an estimate currently exists, including government shipments; the service, retail, and construction sectors; transportation service providers; household goods movers; and municipal solid waste providers.
SOURCES: Commodity Flow Survey data-U.S. Department of Transportation, Bureau of Transportation Statistics (BTS) and U.S. Department of Commerce, U.S. Census Bureau, Commodity Flow Survey (Washington, DC: 2003). Supplemental estimates-MacroSys Research and Technology calculations for BTS based on data compiled from a variety of sources.