Which light combination does NOT indicate a...

Question 1 / 2066636ee928f7522a1c519a71

Question 1 of 2066636ee928f7522a1c519a71

Which light combination does NOT indicate a navigational channel passing under a fixed bridge?

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Question 1 of 20

66636ee928f7522a1c519a71

Which light combination does NOT indicate a navigational channel passing under a fixed bridge?

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🔍 Key Concepts

• Fixed bridge channel marking lights per U.S. Aids to Navigation System • Difference between channel centerline/range lights and pier/obstruction lights • How left descending bank (LDB) and right descending bank (RDB) are marked on rivers

💭 Think About

• For each option, ask yourself: Does this pattern help a mariner FIND and STAY IN a marked channel under the bridge, or does it mark something else? • Think about which light patterns are used to mark the safe line of passage (center of the channel) versus just showing the edges or structures. • Recall which color combinations typically define the limits of the navigable span on rivers where banks are called left and right descending.

✅ Before You Answer

• For each choice, decide: Is this marking the centerline/range of a navigable channel under the span, or only the structure/edges? • Verify which colors (red vs green vs white) are normally associated with safe channel alignment under bridges versus general obstruction/pier marking. • Check whether a pattern of three white vertical lights is standard for indicating a navigational channel under a fixed bridge in U.S. inland waters.

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Question 1 of 20

Which light combination does NOT indicate a navigational channel passing under a fixed bridge?

Two green lights in a range under the span

Red lights on the LDB and green lights on the RDB

A fixed red light on each pier at the channel edge

Three white lights in a vertical line

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Question 1 / 2066636ee928f7522a1c519a71

Question 1 of 2066636ee928f7522a1c519a71

Which light combination does NOT indicate a navigational channel passing under a fixed bridge?

Back

Question 1 of 20

66636ee928f7522a1c519a71

Which light combination does NOT indicate a navigational channel passing under a fixed bridge?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed