8(1)Subject to sub-paragraph (2) below, if as respects any date before the end of the relevant period it appears to the Secretary of State that the aggregate of relevant receipts and assumed interest receipts up to that date is equal to or greater than the aggregate of the amounts required before that date for the purposes mentioned in Part III of this Schedule, the period during which he may levy tolls shall end on that date.E+W
(2)Where—
(a)that date falls before the end of the original maximum toll period; and
(b)the Secretary of State considers it expedient that he should continue to levy tolls for an additional period determined by him in accordance with sub-paragraph (3) below;
the period during which he may levy tolls shall continue until the end of that additional period.
(3)The additional period shall be such period of not more than twelve months, ending not later than the end of the original maximum toll period, as the Secretary of State may consider appropriate for the purpose of making provision out of revenue produced by the tolls during the additional period for meeting expenses properly chargeable to revenue account which are likely to be incurred in, or in connection with, the maintenance of the crossing after the end of the additional period.