changing the direction of engine

transferring wagons to and from parallel tracks without shunting

separating all the sidings and shunting lines from main lines

preventing the vehicles from running off the track

5.5m

6.5 m

7.5 m

8.5m

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i)and(iv)

stop

proceed

proceed cautiously

none of the above

both arms are horizontal

semaphore arm lowered but warner arm horizontal

both semaphore and warner arms lowered

none of the above