In order that the Comprehensive Land Use Plan embodied in this Article shall be property related to a comprehensive plan of thoroughfares for the County, and to assure that the continuing intensification of land use in the foreseeable future will not result in the erection of buildings in locations which will unduly restrict vehicular traffic capacity, it is hereby determined that building setbacks greater than those set forth in the regulations for the respective districts established by this Ordinance are required for buildings adjacent to certain thoroughfares within the County. It is further determined that, in furtherance of this foregoing policy, future street lines may also be required.

Both the building setback lines and future lines referred to in section 21-1 may be specified by the County by the governing body from time to time and shall be shown on a map adopted by the governing body which may also amend any such map from time to time. Before taking any of the foregoing action, the governing body shall refer the proposed map or proposed amendment thereto to the Planning Commission for its recommendations thereon, and shall hold a public hearing on the proposal in accordance with the same procedure as that specified by law in connection with amendments of this Ordinance. Any such map adopted under the provisions of this Article shall be recorded in the office of the Clerk of the Circuit Court.

After the designation of future street lines for any streets as specified in the preceding section, all distances specified in any of the regulations contained in this Ordinance with reference to street lines shall be measured from the future street lines for such street. If any future street lines designated as aforesaid are located other than in relation to an existing street, such lines shall be deemed to be street lines for the purpose of the application of the provisions of this Ordinance.