- All vessels, whether travelling or moored in a line or navigation, must between sunset and sunrise, carry a white light in a lantern on the forepart of steam-vessels in motion shall carry the lights prescribed by the Board of Trade Regulations. Barges or boats attached to a steam-vessel, whether In motion or moored, shall carry the white light prescribed above.Where signals are used, no vessel shall enter or attempt to enter the entrance channel of a lock when a red flag or red light is displayed at the end of the lock next her, but shall wait until the signal intimating 'all clear' is displayed. Steam-vessels approaching a lock shall whistle when a mile distant, and shall continue to whistle at intervals until the signal intimating that the lock is open or closed is displayed, or, if no signals are used, until arrival.
