(a) When the commissioner determines that the topography of the land adjoining a public road will not permit adequate screening of any junkyard lawfully in existence on April 6, 1967, or that such screening would not be economically feasible, the department shall have the authority to acquire, pursuant to any of the procedures for property acquisition authorized in Article 1 of Chapter 3 of this title, such interests in lands as may be necessary to secure the relocation, removal, or disposal of such junkyard. The commissioner shall determine whether it would be more feasible to relocate, remove, or dispose of the junkyards which cannot be screened, and his determination shall be final and conclusive.

(b) All junkyards lawfully in existence on April 6, 1967, which do not conform to the requirements of Code Section 32-6-241 and which, in the determination of the commissioner, cannot be made to conform by screening, shall be required to be removed under this Code section as soon as funds are available for that purpose, provided that the department shall not be required to expend any funds for screening or removal under this article unless and until federal-aid matching funds are made available for this purpose.