Main navigational channel span of a bridge

How the main navigational channel span of multiple-span bridge indicated at night?

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11 Sep '19, 18:59

Sept. 11, 2019, 6:59 p.m.
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Answer:

There will be 3 white lights in a vertical line in the center of the span.

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11 Sep '19, 19:00

Sept. 11, 2019, 7 p.m.
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