(1) The Minister may by regulations made by him under this Act prescribe the method of calculating for the purposes of this Act the passenger accommodation of mechanically propelled vehicles or of any classes or class of such vehicles, and may in such regulations distinguish between sitting accommodation and standing accommodation and between accommodation for adults and accommodation for children.
(2) Every regulation made under this section shall be laid before each House of the Oireachtas as soon as may be after it is made, and if a resolution annulling such regulation is passed by either such House within the next subsequent twenty-one days on which that House has sat after such regulation is so laid before it, such regulation shall be annulled accordingly but without prejudice to the validity of anything previously done under such regulation.