I always enjoy running across these. I read or heard years ago that crossing a river, as here, is the most common place for these. Route Something/SomethingA runs on either side of the river, and where they cross this necessarily happens. However, I don't know how you would measures that easily. I suppose AI could find out just that sort of thing for you now. I always associate this North-South contradiction with different route numbers in town centers.
For locals, this is Queen City Bridge
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They also occur when a bypass route is built around a city. On the south edge of Cedar Rapids, US 218 North runs concurrently with US 151 South over a bypass route built primarily for US 30 West (and vice versa)
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