Question 386Navigation General70% to pass
You are approaching a vertical lift bridge. You know the span is fully open when _______________.
AI Explanation
The correct answer is C) there is a range of green lights under the lift span.
This is the correct answer because the United States Coast Guard regulations specify that a vertical lift bridge is fully open when a range of green lights are displayed under the lift span, indicating it is safe for vessels to pass through. The other answer choices do not accurately reflect the standard visual indications for a fully open vertical lift bridge.
The other answer options are incorrect because: A) a yellow light on the bridge pier indicates the bridge is opening or closing, not fully open; B) three white lights in a vertical line are not the standard indication for a fully open vertical lift bridge; and D) a flashing red light would indicate the bridge is closed or closing, not fully open.
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#384 What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach? #385 The white lights in a vertical line on a multiple-span bridge indicate _______________.#387 If the main channel under a bridge is marked with lights of the lateral system the adjacent bridge piers should be marked with _______________.#388 The channel under a bridge is marked with lights of the lateral system. The centerline of the channel shall be marked on the bridge by _______________.#389 A bridge over a navigable waterway is being repaired. There is a traveler platform under the bridge's deck that significantly reduces the vertical clearance. If required by the CG district commander, how will this be indicated at night?