2(1)In a street with special engineering difficulties street works (other than emergency works) involving—
(a)breaking up or opening the street, or any sewer, drain or tunnel under it, or
(b)tunnelling or boring under the street,
shall not be executed until a plan and section of the works have been settled by agreement between the undertaker and each of the relevant authorities or by arbitration.
(2)For that purpose an undertaker proposing to execute any such works shall submit a plan and section of them to each relevant authority.