|Other and unknown (1)||3.8||3.3|
KEY: (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.
NOTE: 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.