A flashing green light displayed at a single...

Question 1 / 2707066636ee928f7522a1c519748

Question 1 of 2707066636ee928f7522a1c519748

A flashing green light displayed at a single lock means that the lock is __________.

Question 1 of 27070

A flashing green light displayed at a single lock means that the lock is __________.

🔍 Key Concepts

• Inland lock signals used on U.S. rivers and canals • Meaning of a flashing green lock light versus red or amber • Sequence of signals as the lockmaster prepares the chamber for vessels

💭 Think About

• Think about what stage in the locking process a flashing green light would indicate versus a steady green light, if used. • Compare what signal you would expect when a vessel must wait versus when a vessel is permitted to proceed toward the lock. • Consider why there might be a separate indication for "being made ready" compared to "ready" and how that would logically appear to mariners.

✅ Before You Answer

• Verify how U.S. Army Corps of Engineers inland lock regulations define red, amber, and green lock lights. • Check whether "being made ready" normally corresponds to amber/yellow or flashing indications in other maritime signal systems. • Confirm whether a condition where gates "cannot be closed completely" would ever be intentionally shown as ready for entrance.

Question 1 of 27070

A flashing green light displayed at a single lock means that the lock is __________.

ready for entrance, but gates cannot be closed completely

ready for entrance

being made ready for entrance

not ready for entrance