text: I just review mapbox satellite imagery.   It's multilane and divided, and there are no at-grade intersections.  There is no access to properties along the road.   When I last drove on it (within year, ish), it feel like a motorway in terms of how traffic moves.
  
  I don't understand your objection about ramps to "commercial/residential" instead of "primary".  Many ramps off 290 (e.g. Church Street), 190, 495, 95 are to less than primary.  I have never thought of motorway as having rules about the roads ramps connect to, only that ramps should be infrequent enough to feel like exits.  To me, what matters is that there are ramps and the traffic on the motorway is insulated form the local road.
  
  The tagging does change to trunk near the Millbury/Northbridge line, and that seems sensible.  Having it change back (to the south) does not.
  
  I am usually cranky about overtagging, so it's perhaps notable that this doesn't bother me.