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Swapped pairs of route numbers

Started by GenExpwy, July 15, 2018, 02:10:48 AM

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GenExpwy

A small curiosity along the North Dakota — Manitoba border:

Heading north from Rolla ND, North Dakota route 30 becomes Manitoba route 18 at the border.
Farther east, North Dakota route 18 becomes Manitoba route 30 at the border.

Are there any other such "swapped pairs"  at a border?