7. A worker is to be treated as travelling for the purposes of regulations 15(2), 16(2) and (5)(b), 17(1), 18(1) and 19(1)(b) if–
(a)he is in the course of a journey by a mode of transport or is making a journey on foot;
(b)he is waiting at a place of departure to begin his journey by a mode of transport;
(c)where his journey is broken, he is waiting at a place of departure for his journey to re-commence either by the same or another mode of transport, except for any time during such a period he spends in taking a rest break; or
(d)he is waiting at the end of a journey, in the case of regulations 15(2), 16(2), 17(1) and 18(1), for the purpose of carrying out his duties, or, in the case of regulations 16(5)(b) and 19(1)(b), to receive training, except for any time before he is due to carry out his duties or receive training which he spends in taking a rest break.