(1) Each of the following periods or series of periods of driving shall be an excessive period for the purposes of this section:
(a) any continuous period of driving exceeding five and one-half hours;
(b) any series of continuous periods of driving amounting in the aggregate to more than eleven hours in any period of twenty-four hours beginning two hours after midnight;
(c) any period or series of periods of driving so arranged that the driver has not at least ten consecutive hours for rest in every period of twenty-four hours beginning at the commencement of any period of driving.
(2) For the purposes of subsection (1) of this section -
(a) Where a driver has at least nine consecutive hours for rest in a period of twenty-four hours beginning at the commencement of a period of driving, the period of at least nine consecutive hours shall be reckoned as a period of ten consecutive hours if the driver has at least twelve consecutive hours for rest in the twenty-four hours next after the e
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