|$ Billions||Percent||Millions||Percent||Billions||Percent||Average distance per shipment|
|TOTAL All modes||1,448||100.0||2,231||100.0||323||100.0||96|
|Single modes, total||1,371||94.6||2,112||94.6||279||86.3||65|
|Multiple modes, total||71||4.9||111||5.0||43||13.3||834|
|Parcel, U.S. Postal Service, or Courier||8||0.5||<1||<0.1||<1||<0.1||836|
|Other multiple modes||28||1.9||57||2.5||17||5.3||233|
|Unknown and other modes, total||7||0.5||8||0.4||1||0.5||58|
a Truck as a single mode includes shipments that went by private truck only, for-hire truck only, or a combination of both.
b Private truck refers to a truck operated by a temporary or permanent employee of an establishment or the buyer/receiver of the shipment.
c Excludes crude oil shipments.
KEY: S = data are not published because of high sampling variability or other reasons.
NOTE: Numbers and percents may not add to totals due to rounding.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics and U.S. Department of Commerce, Census Bureau, 2007 Commodity Flow Survey, Hazardous Materials table 1a (Washington, DC: February 2010), available at www.bts.gov/publications/commodity_flow_survey/ as of August 2011.