It doesn't make sense to have a primary designation end at a lower priority road. I'm just trying to fill in the gaps, if that makes sense. Full disclosure: this is one of my first edits on OSM, and I'm still trying to grasp the standards here. I'm sorry if I did something wrong, but it doesn't make sense to have a road where all but 3 blocks are primary (take Water St/Pearl St/St. James Pl/Bowery, these are all the same "trunk" corridor, as they handle a significant portion of the north-south traffic.