When encountering another vessel in darkness or reduced visibility, what do visible white, red and green lights indicate?

Explanation:

Red and green lights: These lights are called sidelights, visible to the other vessel approaching head-to-head or from the side. The green light indicates vessel's right side and red indicates a vessel's left side.

White Light: It is called sternlight and is seen only from behind the vessel. White light is also used as masthead light on all power-driven vessels which shines forward and to both sides. Further, All-Round white light may be used to combine stenlight and masthead light into a single white light which can be seen form any direction by the other vessel.

The visible red and green light indicates that you are approaching a sailing vessel head on.  

All these lights serve as navigational aids and have differences purposes. The visible red and green lights are known as sidelights. The light helps boaters to determine which vessels is the give-way vessel when approaching one another at nights.

The four common navigation lights are:

Sidelights are also called combination lights. They are red and green light. They are visible to another boat that is approaching from side or head on. The green light indicates the boat starboard, which is the right hand side and the red light indicates the port side (left) of a vessel.

The sternlight is the white light that is seen from behind the vessel  

The masthead light is a white light that shine forward to all sides and it must be on all power driven vessels. It is a must for all the vessels under engine power to display their masthead light. If this light is not displayed, then it indicates a sailing vessel. This is because sailboats under sail displays only sternlight and sidelights.

All-round white light is a white light that are used to combine a sternlight and masthead light into a single white light so that the light can be seen by other vessels.  

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