(1)It shall be the duty of the Executive to secure that a warning notice meeting the requirements of subsection (2) below shall be posted—
(a)at every Metro stop, in such a position as to be readily visible to prospective passengers; and
(b)in every Metro vehicle, in such a position as to be readily visible to passengers travelling on that vehicle.
(2)A warning notice posted pursuant to subsection (1) above shall (however expressed) indicate the circumstances (as provided in section 4 of this Act) in which persons travelling on a Metro vehicle may be liable to pay a penalty fare and state the amount of the penalty fare.