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When a towing vessel is pushing a barge ahead in a composite unit, it must display the lights of a power-driven vessel. This is because, in terms of navigation rules, the towing vessel operating in this manner is considered to be primarily engaged in propulsion rather than towing. While the barge is being pushed, the combination of the towing vessel and the barge is treated as a single unit for navigation purposes, which is why the lights of a power-driven vessel are required.

A towing vessel has specific lighting requirements depending on its mode of operation. In this case, since the vessel is not merely towing but actively pushing the barge, the requirement aligns with that of a power-driven vessel, which means it must exhibit the appropriate lights to ensure safety and visibility on the water.

This reinforces the importance of understanding the various vessel classifications and their associated lighting configurations under maritime navigation rules. The distinction of being recognized as a power-driven vessel is crucial for proper signaling to other marine traffic and maintaining regulatory compliance.