Final Draft/Rev.5 (3) The Authority shall, when allocating a number capacity, specify, in writing, the purpose for which such capacity may be used. (4) A licensee may apply in writing to the Authority, with the necessary justification to supply it with additional number capacity or address capacity. (5) A licensee shall use only the number or address capacity allocated to it in accordance with subregulation (3), and only for the purpose for which it has been allocated. (6) The Authority may revoke the number or address capacity allocated to the licensee if not used for the purpose for which it was intended or for any other reasonable cause as may have been disclosed to the licensee by the Authority. Infrastructure sharing 35. (1) The Authority shall establish guidelines which set a framework within which communications operators can negotiate and conclude sharing arrangements for communications infrastructure. (2) The Authority may direct communications operators to share infrastructure in order to promote and maintain competition in the market. Right to enter upon land and construct lines 36. (1) A licensee may, for the purposes of providing a telecommunications service, seek permission in writing to the local authority or any person owning or having the control and management of any land, street, road, footpath, waterway or railway(a) to enter upon such land, street, road, footpath, waterway or railway and there construct or maintain or remove any telecommunication line or pipe or conduct any other work necessary for such lines upon, under, over, along or across any such land, street, road, footpath, waterway or railway; and (b) to alter or cause to be altered the position, under the ground, of any pipe other than a sewer, drain or mains for the supply of water, gas or electricity. (2) A local authority or person to which or to whom any such pipe belongs or by which or by whom it is used shall be entitled, while work in connection with the removal or alteration in the position thereof is in progress, to supervise that work, and the licensee shall pay all expenses incurred by such local authority or person in connection with such removal or alteration or in connection with the supervision of the work relating to such removal or alteration. 19