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This routing option refers to Intra-US, Intra-Canada, and Intra-Mexico routing. If Borders Open is checked, the route you generate will ignore international boundaries when necessary to come up with the best route. If this option is not checked, the borders will not be crossed; for example, if all your stops are in the United States, the resulting route will stay in the United States even though the most practical or shortest route would normally involve some Canadian mileage.
The Borders Open option is checked by default, you must remove the check mark to close the borders for a route.