15.—(1) A street authority and the undertaker may enter into agreements with respect to—
(a)the construction of any new street including any structure carrying the street over or under an electric line authorised by this Order;
(b)the maintenance of the structure of any bridge or tunnel carrying a street over or under an electric line authorised by this Order;
(c)any stopping up, alteration or diversion of a street authorised by this Order; or
(d)the carrying out in the street of any of the works referred to in article 10 (street works).
(2) Such an agreement may, without limitation on the scope of paragraph (1)—
(a)make provision for the street authority to carry out any function under this Order which relates to the street in question;
(b)include an agreement between the undertaker and the street authority specifying a reasonable time for the completion of the works; and
(c)contain such terms as to payment and other matters as the parties consider appropriate.