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INTERNATIONAL PORT TRAFFIC SIGNALS

A unified system of Port Traffic Signals will be progressively introduced worldwide as and when new or revised signals are needed by a Port Authority. The new signals will be used to control traffic movements in ports and port approaches, and may be used at locks or movable bridges. They are simple and easy to commit to memory and use only lights by day or night. The main message will always be given by three lights vertically disposed. Provision is made for small vessels navigating outside the main channel to disregard the main message. This signal will be particularly useful at large ports with a wide access channel.

Auxiliary signals may be added, as required, to the right of the column carrying the main message using either white or yellow lights. An auxiliary signal may, for example, be added to message No: 5 to give information about the situation of traffic in the opposite direction, or to warn of a dredger operating in the channel (see illustration).

Signal

Main Message

Signal

Main Message

flashing

Serious emergency — all vessels to stop or divert according to instructions.      

fixed

or

slow

occu-

ting

 

Vessels shall not proceed.

fixed

or

slow

occu-

ting

Vessels shall not proceed, except that vessels which navigate outside the main channel need not comply with the main message.

Vessels may proceed. One way traffic.    

Vessels may proceed. Two way traffic.    

A vessel may proceed only when it has received specific orders to do so.

A vessel may proceed only when it has received specific orders to do so; except that vessels which navigate outside the main channel need not comply with the main message.

RULES FOR PORT TRAFFIC SIGNALS

1. The Main Movement message given by a Port Traffic Signal shall always comprise 3 lights vertically disposed. No additional light shall be added to the column carrying the main message.

2. Red lights indicate "Do not Proceed".

3. Green lights indicate "Proceed, subject to the conditions stipulated".

4. A single yellow light displayed to the left of the column carrying main messages Nos. 2 or 5, at the level of the upper light, may be used to indicate that "Vessels which can safely navigate outside the main channel need not comply with the main message".

5. Signals auxiliary to the main signal may be devised by the appropriate Local Authority. Such auxiliary signals should employ only white and/or yellow lights and should be displayed to the right of the column carrying the main message.

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