Power to execute street works  12. —(1) The Authority may, for the purpose of exercising the powers conferred by article 11  (power to keep apparatus in streets) or any other provision of this Order, enter upon any street and  may execute any works required for or incidental to the exercise of those powers including,  without limitation on the scope of that power, breaking up or opening the street, or any sewer,  drain or tunnel under it, or tunnelling or boring under the street.  (2) The powers conferred by this article must not be exercised within the boundaries of a street  outside of the Order limits and the limits of deviation without the consent of the street authority,  but such consent must not be unreasonably withheld.  13. —(1) Subject to the provisions of this article, the Authority may, in connection with the  construction of the authorised works, stop up each of the streets specified in columns (1) and (2)  of Parts 1 and 2 of Schedule 3 (streets to be stopped up) to the extent specified, by reference to the  letters shown on the works and land plans, in column (3) of those Parts of that Schedule.  (2) No street specified in columns (1) and (2) of Part 1 of Schedule 3 (being a street to be  stopped up for which a substitute is to be provided) is to be wholly or partly stopped up under this  article unless—  (3) No street specified in columns (1) and (2) of Part 2 of Schedule 3 (being a street to be  stopped up for which no substitute is to be provided) is to be wholly or partly stopped up under  this article unless the condition specified in paragraph (4) is satisfied in relation to all the land  which abuts on either side of the street to be stopped up.  (4) The condition referred to in paragraph (3) is that—  (5) Where a street has been stopped up under this article—  (7) This article is subject to paragraph 2 of Schedule 9 (provisions relating to statutory  undertakers etc.).  (6) Any person who suffers loss by the extinguishment of any private right of way under this  article is entitled to compensation to be determined, in case of dispute, under Part 1 of the 1961  Act.  14. —(1) The Authority may, during and for the purposes of the construction of the authorised  works, temporarily stop up, alter or divert any street and may for any reasonable time—  Stopping up of streets  (a) the new street to be substituted for it, which is specified in column (4) of that Part of that  Schedule, has been completed to the reasonable satisfaction of the street authority and is  open for use; or  (b) a temporary alternative route for the passage of such traffic as could have used the street  to be stopped up is first provided and subsequently maintained by the Authority, to the  reasonable satisfaction of the street authority, between the commencement and  termination points for the stopping up of the street until the completion and opening of  the new street in accordance with sub-paragraph (a).  (a) the Authority is in possession of the land; or  (b) there is no right of access to the land from the street concerned; or  (c) there is reasonably convenient access to the land otherwise than from the street  concerned; or  (d) the owners and occupiers of the land have agreed to the stopping up.  (a) all rights of way over or along the street so stopped up are extinguished; and  (b) the Authority may appropriate and use for the purposes of its tramway undertaking so  much of the site of the street as is bounded on both sides by land owned by the Authority.  Temporary stopping up of streets  13