Section 31(14) in The Delhi Metro Airport Express Line, General Rules, 2010
(14)In case of low visibility rendering the sighting of signals difficult, the train operator while driving in the Coded Manual Mode or Cut out mode or Restricted Manual Mode shall not proceed unless authorised specifically by the Traffic Controller, in which case he shall proceed very cautiously and be prepared to stop short of any obstruction and when the visibility is restored to normal, he shall advise the Traffic Controller and proceed as per instructions given by him.
