When approaching a lock entrance, the visual...

Question 1 of 2707066636ee928f7522a1c51916c

When approaching a lock entrance, the visual signal displayed when a single lock is ready for entrance is a flashing __________.

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Question 1 of 27070

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When approaching a lock entrance, the visual signal displayed when a single lock is ready for entrance is a flashing __________.

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🔍 Key Concepts

• Inland Navigation Rules and local lock regulations often specify light signals for lock operations • Difference between signals for lock ready for entrance vs. stop / do not approach • Common color meanings in navigation: red = stop, green = proceed, but note that locks may use different conventions

💭 Think About

• Think about what color would clearly indicate that a vessel is permitted to move ahead into the lock, as opposed to having to wait outside • Consider how a single flashing light might be used differently from a pair or combination of lights (for example, one for approach, one for enter) • Eliminate any colors that are more commonly associated with danger, obstruction, or restricted passage in other navigation contexts

✅ Before You Answer

• Check what color is typically associated with entry permission specifically at locks, not just at traffic signals or buoys • Verify whether a flashing red at a lock would more likely mean stop/wait or enter • Confirm that the correct choice refers to a single flashing light meaning the chamber is ready and you may proceed to enter, not just approach and stand by