Final Draft/Rev.5 (b) crossing any land, street road or footpath, at least 5 metres above the surface of the ground; and (c) crossing a main road or railway, at least 60 centimetres below the surface of the ground. (2) A licensee shall take such steps, at its own expense, as it considers it necessary to effect relief to the owner or occupier of any land who proves, to the satisfaction of the licensee, that he or she is obstructed in the free use of the land by reason of the insufficient height or depth of any telecommunication line. Alteration of works at request of local authority or other person 40. (1) Where, as a result of any works undertaken by a local authority or any person, it becomes necessary to alter any pre-existing telecommunication line, the cost of such alteration shall be borne by such local authority or person. (2) Where any telecommunication line passing over private property interferes with any building about to be erected on that property, the owner or occupier of that property shall so notify the licensee responsible for that line in writing, and also, at the same time, provide proof that such building is to be erected. (3) The licensee shall, within four weeks of receiving such notification and proof referred to in subregulation (2), cause the line to be altered in such a manner as will remove all obstacles to building operations. (4) Where the owner or occupier of any land through which a telecommunication line passes requests a licensee to alter or move any telecommunication line for any reason other than as provided in subregulation (2), the licensee shall, within 28 days of such request, either comply with the request or, if it does not so comply, so inform the owner or occupier in writing, giving reasons for its decision not to comply. (5) Where there is no agreement between the licensee and the owner or occupier of land referred to in subregulation (4), the matter may be referred to the Authority for determination. Damage to property or injury to persons 41. (1) A licensee shall, in carrying out any work required for its purposes – (a) exercise due care; (b) carry out such work with regard to the safety and convenience of the owners or occupiers of the land, street, road, footpath, waterway or railway upon which the work is carried out; 21