ADR 2015 8.3.1 explains in part: “Apart from members of the vehicle crew, no passengers may be carried in transport units carrying dangerous goods”. If there are other members of the vehicle crew they must be also be trained when dangerous goods are being carried. Untrained crew members are permitted to travel in the vehicle as part of on the job training, however their actions must be under the direct supervision of a trained person and their subsequent training must be taken as soon as is practicably possible. If the transport unit is in scope of Regulations (i.e. CDG or ADR) then it is the ADR licence holder who must drive the vehicle. There is an exception to the no passenger rule where very low risk Class 7 Radioactive packages bearing I-WHITE labels are being carried.