Where uncertainty exists with respect to the boundaries of the district as indicated on the zoning map, the following rules shall apply:
A. Where district boundaries are indicated as approximately coinciding with the center lines of street, highways, railroad lines or streams, such center lines shall be construed to be such boundaries.
B. Where district boundaries are so indicated that they approximately coincide with lot lines, such lot lines shall be construed to be said boundaries; or where district boundaries are extensions of lot lines or connect the intersections of lot lines, such lines shall be said district boundaries.
C. Where district boundaries are so indicated that they are approximately parallel to center lines of streets or highways, such district boundaries shall be construed as being parallel thereto.
D. Where a vacated street is bounded on either side by a different zoning district, the former center line of the vacated right-of-way shall be considered the zoning district boundary line.