Except as otherwise provided in this Code section and Code Section 32-6-116, no commercial enterprise or activities shall be authorized or conducted by the department or any other agency or by a county or municipality of the state, within or on the property on which have been constructed limited-access roads as defined in this article, provided that the term "commercial enterprise or activities" shall not be so construed as to prevent the installation of public utility facilities, to the extent that it is authorized by law, or as to prevent the proper management of property acquired for future construction of public roads, including limited-access roads, as such acquisition is authorized in Article 1 of Chapter 3 of this title.