The Secretary of State may by order designate highways or proposed highways as highways which are to be GLA roads.
Any highway or proposed highway so designated—
shall become a GLA road, and
if it is a trunk road or other highway for which the Secretary of State is the highway authority, shall accordingly cease to be such a road or highway,
on such date as may be specified in that behalf in the order.
Orders under this section may be made or amended at any time before the beginning of the term of office of the first Mayor of London.