I'm going a bit out of bounds with that one, but with that "exit-1-on-both-sides-of-the-border" thing, province of Quebec have now two points where "kilometer 0" is at the same place for two different jurisdictions.
- This one, because NB consider TCH-2 as an East-West highway, so the NB-QC border is the westernmost point of this highway, while QC consider A-85 as an North-South highway, even if the general orientation is east-west, because it's perpendicular to the St. Lawrence River, so the QC-NB border is the southernmost point of their highway.
- The other one is at the QC-ON border, where A-40 in QC becomes ON-417. Tne Ontario transport authority decides to place "km 0" of the 417 at its easternmost point of the highway because they have no idea of where this highway would start on its westernmost point, nor even if the 417 will connect with MB border one day. I expect teleportation will exist way before the 417 will reach Manitoba! Can you imagine an exit 2146, instead of exit 5, on your way to St. Eugene, ON?