NOTES FOR DATA ON THIS PAGE: Data do not include transshipment activity. Transshipments
are shipments that enter or exit the United States by way of a U.S. Customs
port on the northern or southern border, but whose origin or destination is
a country other than Canada or Mexico. All figures are based on the declared
gross shipment weight and include packaging. Shipping weight for imports may
be underestimated because U.S. Customs Service does not require weight to be
reported at the individual commodity level for surface trade.
SOURCE FOR DATA ON THIS PAGE: U.S. Department of Transportation, Bureau of
Transportation Statistics, Transborder Surface Freight Data, available
at http://www.bts.gov/ntda/tbscd/reports.html
as of August 2002.