N.D. Cent. Code § 39-10-22.1

A vehicle entering a freeway, as defined in section 24-01-01.1, from an acceleration lane, ramp, or any other approach road shall yield the right of way to a vehicle on the main roadway entering the merging area at the same time, regardless of whether the approach road is to the left or the right of the main roadway, unless posted signs indicate otherwise.