<https://www.diverseyyachtclub.org/blog/how-can-you-recognize-a-commercial-vessel-towing-at-night-best-solution.html#webpage>
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"When a commercial vessel is towing or pushing a barge, one or more yellow lights are displayed in place of a sternlight to alert the crew. Several hundred"
<https://www.diverseyyachtclub.org/blog/how-can-you-recognize-a-commercial-vessel-towing-at-night-best-solution.html>