SCHEDULE 2 CONDITIONS AND REQUIREMENTS TO BE COMPLIED WITH BY THE RAILWAY UNDERTAKING
11. When the ‘lower’ push-button is pressed, or the train initiates the automatic lower sequence, the sequence of events to close the crossing to road traffic shall begin. The sequence shall be:
(a) the amber lamps shall immediately show, and the audible warning shall begin. The lights shall show for approximately 3 seconds;
(b) immediately the amber lamps are extinguished the intermittent red lights shall show;
(c) 4 to 6 seconds later, the left-hand side barriers shall begin to descend and shall take a further 6 to 10 seconds to reach the lowered position;
(d) all boom lights shall illuminate when the first barrier moves out of the fully raised position;
(e) once the entrance barriers have reached the down position the right-hand side barriers shall then begin to descend taking 6 to 10 seconds to reach the lowered position;
(f) the audible warning shall stop when all the barriers are fully lowered;
(g) the train can then approach and pass over the crossing.

Sch. 2 para. 11 in operation at 20.2.2023, see art. 1(1)