1 Other and unknown includes
"flyaway aircraft" (i.e., aircraft moving from the manufacturer to
a customer and not carrying any freight), vessels moving under their own
power, pedestrians carrying freight, and miscellaneous.
NOTES:
These data reflect U.S. import and export trade with Canada and Mexico.
Weights of export shipments by land modes are estimates from the Bureau of
Transportation Statistics.
SOURCE: U.S. Department of Transportation, Research and
Innovative Technology Administration, Bureau of Transportation Statistics,
Transborder Freight Data, as of May 2005.
