The situation where, during each period of driving between any two consecutive daily rest periods, or between a daily rest period and a weekly rest period, there are at least two drivers in the vehicle to do the driving. For the first hour of multi-manning the presence of another driver or drivers is optional, but for the remainder of the period it is compulsory. This allows for a vehicle to depart from its operating centre and collect a second driver along the way, providing that this is done within 1 hour of the first driver starting work.