|United States, total||3,947||4,358||4,526||4,305||4,427|
NOTES: Data represent the number of truck crossings, not the number of unique vehicles, and include both loaded and unloaded trucks. The data for incoming trucks exceeds the data for truck containers loaded and unloaded (empty) because some incoming trucks do not carry a container.
SOURCE: U.S. Department of Transportation, Bureau of Transportation Statistics, special tabulation, June 2003. Based on the following primary data source: U.S. Department of Treasury, U.S. Customs Service, Office of Field Operations, Operations Management Database.