Directions

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