Whenever, in the judgment of the county executive, it is necessary for the safety or control of vehicular traffic and parking or for pedestrian safety, he is authorized to provide by executive order for the erection of no stopping, no standing, no parking, and other parking control signs and devices on public streets, highways or other areas in the county; provided, that no such sign or device shall be erected on state highways without the approval of the state highway administration; and provided, that no such sign or device shall be erected at the cost of the county government in any incorporated town or special taxing area unless the council has by resolution consented to the payment of such costs; and provided, that if the private owner of any land used by the general public shall cause to have erected no-stopping, no-standing, no-parking or other parking control signs or devices upon streets, highways, and other areas within said private property, said signs shall conform to the most recent edition of the "Manual on Uniform Traffic Control Devices for Streets and Highways" with regard to design, color, size and placement. (1978 L.M.C., ch. 7, § 2; 1981 L.M.C., ch. 40, § 3; 1984 L.M.C., ch. 24, § 36; 1984 L.M.C., ch. 27, § 22.)