11. The Executive may, for the purpose of exercising the powers conferred by article 10 and the other provisions of this Order, enter upon any street in which any authorised street tramway is or is to be laid and any street having a junction with such a street, and may execute any works required for or incidental to the exercise of those powers including, without prejudice to the generality of the foregoing, breaking up or opening the street, or any sewer, drain or tunnel under it, or tunnelling or boring under the street.