Zone boundary lines are intended to follow the center line of streets, streams, railroad rights-of-way, and lot property lines as they exist on plats of record at the time of the passage of this chapter, unless such zone boundary lines are fixed by dimensions as shown on the Zoning Map.

The location of any disputed zone boundary line shall be determined by the Land Use Board acting as the Zoning Board of Adjustment.

Where zone boundaries are not fixed by dimensions, and where they approximately follow lot lines, and where they do not scale more than 20 feet distant therefrom, such lot lines shall be construed to be the zone boundary line unless specifically shown otherwise.

In unsubdivided land and where a zone boundary divides a lot, the location of the zone boundary line shall be determined by the use of the scale appearing thereon, unless the location of the zone boundary line is indicated by dimensions (in feet) shown on the zone map.

Where a street or public way serves as the zone boundary, and it is lawfully vacated, the former center line shall be considered the zone boundary.