On the date declared by the traffic authority, by notice published in the prescribed manner, to be the date on which a special road, or a part of a special road, is open for use as a special road, any existing order under section 1, 6, 9 or 84 of this Act relating to that road or part shall cease to have effect.

This is without prejudice to any power to make orders under those provisions in relation to the road or part as a special road; and any such power may be exercised before the date referred to above, so as to take effect on that date.

The procedure for making an order applies in such a case with such modifications as may be prescribed.