(1) All hand signals shall be exhibited by day by showing a flag or hand(s) and by night by showing a light as prescribed in these rules.
(2) During day, a red or green flag shall normally be used as hand signals and the hands shall be used in emergencies only when flags are not available.
(3) During night and bad weather impairing visibility, a hand signal shall normally be given by showing a red or green light. When the red light is not available a white light waved violently in horizontal direction shall be used.
(4) Red or green light referred to in sub-rule (3) of the rule 38 shall be flashing type.
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(5) The size of hand signal flags (green and red) shall be in accordance with special instructions.
(6) Red flag shall normally be kept in the active hand and green flag in the other hand.