Whenever the public peace, safety, comfort, convenience, interest or welfare may require, the Board of Supervisors shall determine the minimum distance back from the street line for the erection of structures along any portion of any existing street or portion thereof or any future street in the county and to establish a line to be known and designated as the plan line, between which line and the street line no structure shall be erected or constructed.
(1966 Code, § 12B-10) (Ord. 292, § 10)