Which light signal indicates that you may...

Question 1 of 2707066636ee928f7522a1c519ab8

Which light signal indicates that you may approach the lock?

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Question 1 of 27070

Q

Which light signal indicates that you may approach the lock?

🔍 Key Concepts

• Inland lock light signals used by the U.S. Army Corps of Engineers on rivers and canals • How red, amber, and green are generally used in control signals (stop / caution / proceed) • Difference between flashing and steady lights in signaling

💭 Think About

• Think about which color typically means you are allowed to proceed, and which colors usually require you to stop or wait • Consider why a lock might use a flashing light instead of a steady one for certain phases of operation • Ask yourself: when would an amber (yellow) signal be used around a lock—does it usually mean approach, prepare, or stay clear?

✅ Before You Answer

• Verify which signal specifically means “Lock is ready – you may approach” in the standard inland lock light system • Distinguish between what each color means: red vs amber vs green in the context of locks, not just traffic lights • Confirm whether the flashing or steady version of a color changes its meaning for lock operations