Windsor-Detroit is probably the key crossing. I know there are members here who are from the west coast, and I think probably there are issues at the crossings between B.C. and Washington State. Also, there are the issues at the Peace Bridge, where there have been proposals for a long time to have a pre-clearance facility on the Canadian side of the border going into the United States, and that's a key issue as well.
On November 28th, 2006. See this statement in context.