All streets, roads, highways, alleys, public
ways and railroad rights-of-way, if not otherwise specifically designated,
shall be deemed to be in the same district as the property immediately
abutting upon the same. Where the center line of a street, road, highway,
alley, public way or railroad right-of-way serves as a district boundary,
the zoning of such areas, unless otherwise specifically designated,
shall be deemed to be the same as that of the abutting property up
to such center line.