(a) which is displayed on a vehicle which is being used on a proclaimed road, if it is proved that the main purposes for which that vehicle is being so used is not display that advertisement; (b) which is displayed in an urban area; (c) which a person in the service of the State or of a body which is empowered by an ordinance relating to roads to construct or maintain roads displays in the performance of his duties in such service; (d) which is displayed on a proclaimed road in accordance with the consent of an authority authorized by an ordinance relating to roads to construct and maintain that road, and which merely indicates that a road or path leading out of the said proclaimed road, is a private road or path or is intended for a particular class of traffic or leads to a particular place or to land owned, leased or occupied by a particular person or which conveys merely a warning; [Para. (d) amended by s. 3 of Ord. 3 of 1967.] 7. (e) which is displayed on a windmill or on a vehicle or implement or machinery used in connection with farming, if such advertisement consists only of a trade name or the name of the maker or manufacturer of such windmill, vehicle or implement or machinery, or of both such trade name and name, and the chief purpose for which such windmill, vehicle or implement or machinery is used, is not the display of such advertisement. (1) The Executive Committee may in the Official Gazette proclaim any proclaimed road or any section of a proclaimed road to be a building restriction road for the purposes of this Ordinance, and he may by a like proclamation withdraw such first mentioned proclamation and there upon the road or section of a road in question shall cease to be a building restriction road. (2) When the Executive Committee has proclaimed a road to be a building restriction road, he shall cause as many suitable notices of that proclamation as he may deem necessary to be erected along the road or section of the road to which the proclamation relates, and upon withdrawal of the proclamation he shall cause those notices to be removed. 8. (1) Subject to the provisions of sub-section (2) no person shall erect or permit the erection of any structure which is attached to the land on which it stands even though it does not form part of that land within a distance of one hundred metres from the central line of a trunk, main or building restriction road, except in accordance with a permission in writing granted by the Executive Committee: Provided that the preceding provisions of this section shall not apply to- (a) the completion of a structure whose erection was started on a date before the road in question became a trunk, main or building restriction road or before the coming into operation of this Ordinance which-ever date is the later; (b) a structure erected by the Railways Administration on land under its control; (c) a structure erected in an urban area or on an erf or lot in a township which was in existence as such at the commencement of this Ordinance;