Question 385Navigation General

70% to pass

The white lights in a vertical line on a multiple-span bridge indicate _______________.

A scaffolding under the span is reducing the vertical clearance
B the main channel
C the river is obstructed under that span
D the draw span is inoperable
AI Explanation

The correct answer is B) the main channel. The white lights in a vertical line on a multiple-span bridge indicate the location of the main navigable channel for vessels. This is a standard navigation aid that helps mariners identify the safest and deepest part of the waterway to transit. The other answer choices are incorrect because they do not accurately describe the purpose of these vertical white lights on a bridge.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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