How is centerline, and stationing defined?
I tend to hold the centerline monuments if they are in. If not, I use the R/W monuments to re-establish the centerline. Roads are rarely designed and/or dedicated using broken back curves and I would need a real good reason to create one were it not called for.
I start with a very close inspection of the highway plans. Too many times the base line, the project center line and the center line of the pavement are three different things. ROW markers are nice but one must recall most of them were set by contractor staff, not surveyors. Anymore it is common to find nothing but a 60D nail at the ROW change points. I tend to favor box culverts and bridges to lock in control. But, you must double check the plans on those as frequently the box culvert is set with one side longer than the other side relative to the true centerline.
Right-of-way locations can depend on any number of things. What was the applicable law at road creation? What method was used to create the road? Has anything been done to modify the road?
In over 40 years I have not seen a one size fits all method in any jurisdiction. It's like everything we do. What does the evidence tell you to do in this situation?
If the paint line moves, (gets re painted) does the road move?
Our DOT believes that the invisible, usually unmonumented, "centerline" controls. By doing so they reject nearly every monument along the sidelines. Curiously, they establish their "centerline" from monuments that may be hundreds or even thousands of feet away from the sidelines. I believe that we were directed long ago by the courts that monuments control over math, so I almost always accept monuments I find along the sidelines. If I find monuments at or near both a PC and PT I re-establish the arc as being non-tangent, record radius curve between the monuments.