Pier fire
Pier lights or entrance lights are beacons at the end of a pier (harbor wall). These nautical signs , as lateral signs, mark the entry into a port or into a narrow ship passage. According to the international IALA agreement, they are colored red or green. They also serve as a warning of the artificial structure itself. Pier lights are fixed lights or flashing lights . In harbors with only one large pier, only one pier light is set up.
In Europe (IALA region A), when entering the bottleneck, there must be a red pier light on port and a green one on starboard . If both types of pier lights are present, you must pass between them. When the two piers are one behind the other when viewed from the sea, the colors appear “reversed”; then you have to drive parallel to the coast until the colors appear on the "correct" side.
In smaller harbors, a pier light can consist of a steel mast with a lantern that marks the end of a pier. The entry of larger harbors is also secured with complex structures for pier lights. These structures are more like a full-fledged lighthouse .