Parallel to lot, boundary or street lines. Where district boundaries are so indicated that they are approximately parallel to the Town boundary line, street lines, property lines, lot lines, right-of-way lines or center lines of public utility easements, lands or structures and projections thereof, said boundaries shall be construed as being parallel thereto and at such distances therefrom as are indicated on the Zoning Map or as shall be determined by the use of the scale shown on the Zoning Map.