When approaching a lock entrance, which...

Question 1 / 2707066636ee928f7522a1c51916b

Question 1 of 2707066636ee928f7522a1c51916b

When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?

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Question 1 of 27070

When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?

🔍 Key Concepts

• Inland navigation lock signals used on U.S. rivers and canals • The meaning of flashing lock lights versus fixed or steady lights • How signals differ when a lock is ready for entrance versus stand clear / do not enter

💭 Think About

• Think about which color is commonly associated with "permission to proceed" in other navigation and traffic systems, and see if that pattern applies here. • Consider what light you would expect to see when the lock chamber is prepared, gates are open (or about to open), and the lockmaster wants to bring you in safely. • Ask yourself: which colors are more typically used to warn vessels to wait, stop, or exercise extra caution near a restricted area like a lock?

✅ Before You Answer

• Verify what color light is specified in Inland lock regulations for "lock ready for entrance" rather than for "stand clear" or "approach with caution." • Confirm that the signal in question is specifically a flashing light, not a fixed or occulting one. • Double-check that the question is about a single lock ready for entrance, not about a double lock, danger condition, or emergency signal.

Question 1 of 27070

When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?

A red light

A green light

A white light

An amber light

Question 1 / 2707066636ee928f7522a1c51916b

Question 1 of 2707066636ee928f7522a1c51916b

When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?

Back

Question 1 of 27070

When approaching a lock entrance, which flashing light is the visual signal displayed when a single lock is ready for entrance?