Where boundaries are indicated as approximately following a street, alley, railroad right-of-way, watercourse channel, or other rights-of-way, the center line of such right-of-way shall be considered the zone boundary, but if the street, alley, railroad right-of-way, watercourse channel, or other right-of-way abuts a freeway on the opposite side of the zone boundary, then the zone boundary shall extend across the entire right-of-way.

Where boundaries are indicated as following lot or parcel lines not abutting a right-of-way, such lines shall be considered the zone boundary.

Where a zone boundary divides a lot or parcel of land and is not dimensioned, the boundary shall be determined by the scale on the Official Zoning Map.

Where any right-of-way, or any portion thereof, is vacated or abandoned, the zone and regulations of the vacated or abandoned portion of such right-of-way shall be the same as that of the property to which such right-of-way reverts.