(1) The Minister may make regulations prescribing, in respect of all public roads (other than motorways), or all public roads (other than motorways) with such exceptions as may be specified in the regulations, a speed limit (which shall be known as a general speed limit) for all mechanically propelled vehicles.
(2) Regulations under this section prescribing a general speed limit may except any class of vehicles from the limit and may restrict the limit to a particular period or to particular periods.