Do you mean survey as in determining the boundaries or survey as in extensively investigating and determining conditions along a particular stretch of said road?
Answer to Question A - for much of the island there is a surveyed, marked and legally declared roadway. It is interrupted here and there by large parcels of land that have not had a through-way demised legally through it. One assumes that the power lines follow the eventual declared road but that might not be true in all cases - evidenced by a recent relocation of service poles. In some areas the throughway (primarily north-south) is declared to be 40 feet wide and in others as little as 25. Legend has it that the initial owners of Journey's End were opposed to the idea of a road and in that spirit, built rooms in the intended roadway. A long time ago, and for a long time, many/most of the residents north of Journey's End applauded that bottleneck, but today opinions on the necessity of a road seem much changed.
Further comment on parts of the intended north-south trunk road are that portions of it are in very wet areas - some with year-round standing water.
As for the second kind of survey - conditions, analysis etc - there has been a reasonably comprehensive plan for a north-south trunk road on paper for many years. It requires a substantial sum of cash to do it right, and investors are being sought for this project. Last year it looked like the money was about to come forward and the road project would be a reality. Unfortunately the investor couldn't fulfill his financial promises. The "big" road remains a paper-project in search of funding.