While there are more than fifty (50) ports of entry (POEs) along the 49th parallel between the Western U.S. and Canada, the vast majority of the cross-border traffic is concentrated in a small number of crossings. In most cases, these crossings are on the most direct routes between Canadian population and production centers north of the border and principal U.S. transportation networks south of the border. The heaviest concentration by far of both non-commercial and commercial traffic is in the Pacific Highway Corridor--specifically the crossings in Whatcom County, WA. Appendix A (paged A-3 to A-6) provide summaries of 1992 commercial and total highway traffic volumes by state and port of entry. As shown below, Washington State/British Columbia crossings accounted for more than half (53%) of total Western U.S.-Canada commercial traffic volume in 1992 and more than three quarters (77.3%) of total highway traffic volume.


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