Rt. 9 is still "twisty, narrow, hummocky". Roads might have been repaved twice, by the State of Maine. Scary sometimes, I thought that it was the wrong road.
The only improvement that I can see is that they have two border control stations now.
The new one is the International Avenue entrance, very comfortable and convenient, while keeping the old downtown Calais entrance.
Irvin built a large gas station on US side, right before the border controls, very comfortable.
Rt. 95 to Woodstock, NB/Houlton, ME should have better road, supported by the US federal government. Double lanes rather than single lane along Rt.9. I guess "live and learn."
I picked up a nail along downtown Bridgewater, near a construction site, along LaHave River, on return trip with my Honda CRV. I managed to visit Peggy's Cove, took the Saint John ferry, overnight at Bangor Maine, visited the Acadia National Park, drove along Maine coast to return to Boston area, then fixed the nailed tire.