local knowledge and the aid of a map provided by the state government
https://www.rms.nsw.gov.au/projects/01documents/new-england-highway/scone-rail-level-crossing/scone-bypass-map.pdf

The LPI NSW Base Map is out of date by a few years. I have a lot of local knowledge of the area and the highway is due to open in a couple of months. I am still learning all the editing rules. I will fix the tags so the changes are usable for routing apps.

The current Pacific highway is using the new southbound carriageway. More information can be found here http://www.rms.nsw.gov.au/projects/northern-nsw/oxley-highway-to-kempsey/kundabung-to-kempsey.html