Where a district boundary line is shown as approximately following the center line of a street or highway, the line shall be construed to be the entire street of the more restrictive zone.

Where a district boundary line is shown as following a lot line, such lot line shall be construed to be the boundary.

Where a district boundary line is shown as approximately following the Borough limits, the boundary shall be construed to be the Borough limits.

Where a district boundary line is shown as approximately parallel to a street or highway, the boundary shall be construed as being parallel thereto and at such distance from the nearest right-of-way line thereof as indicated on the Zoning Map.

In all other cases, distances not specifically indicated on the Official Zoning Map shall be determined by the scale of the map.