7.—(1) In this Order “the street authority” in relation to a street means, subject to the following provisions—
(a)if the street is a road, the Department, and
(b)if the street is not a road, the street managers.
(2) Paragraph (1)(b) has effect subject to Article 46 as regards the application of this Order to prospective roads.
(3) In this Order the expression “street managers”, used in relation to a street which is not a road, means the authority, body or person liable to the public to maintain or repair the street or, if there is none, any authority, body or person having the management or control of the street.
(4) The Department may by regulations make provision for exempting street managers from provisions of this Order which would otherwise apply to them as the street authority in relation to a street.
(5) References in this Order to the relevant authorities in relation to any works in a street are to the street authority and also—
(a)where the works include the breaking up or opening of a public sewer in the street, the Department;
(b)where the street is carried or crossed by a bridge vested in a transport authority, or crosses or is crossed by any other property held or used for the purposes of a transport authority, that authority; and
(c)where in any other case the street is carried or crossed by a bridge, the bridge authority.