When passing through a lock, which light means "approach the lock under full control"?

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The signal indicating "approach the lock under full control" is represented by the amber light. This light serves as a warning or caution, advising operators of vessels to approach the lock in a safe, controlled manner. It is essential to navigate through locks with caution due to the potential for strong currents and unexpected conditions.

The amber light emphasizes the importance of readiness and control when approaching the lock. Since the operation of locks often involves coordination with lock personnel and may require adjustments in speed and maneuvering, understanding and responding to this signal helps ensure the safety of all vessels as they enter the lock chamber.

The other colors, such as red and green, typically convey different signals—red indicates a stop, while green generally signals that it's safe to proceed. The blue light is not commonly associated with lock signals. Thus, recognizing the meaning of the amber light is crucial for safe navigation through locks.

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