2(1)The suspension period specified in a direction under paragraph 1(1) may be no longer than six hours, subject as follows.
(2)If after giving a direction under paragraph 1(1) the Secretary of State considers that there is or will be a risk of the kind referred to in paragraph 1(2)(a) if the suspension period is not extended, the Secretary of State may before the expiry of the period extend it by notice in writing to the operator (and may do so more than once).
(3)The first notice under sub-paragraph (2) in relation to a suspension period may not extend the period for more than six hours from the time at which it would otherwise expire.
(4)A second or subsequent notice under sub-paragraph (2) in relation to a suspension period may not extend the period for more than twelve hours from the time at which it would otherwise expire.