Which statement is TRUE regarding lights on two barges being pushed by a tugboat?

When two barges are being pushed by a tugboat, they are considered to be part of a single unit, meaning they should be lighted as one vessel. This is important for ensuring that other vessels can clearly identify the overall configuration and size of the tug and barges, especially when navigating in restricted visibility or busy waters.

In accordance with navigation rules, vessels that are pushed or towed are treated as a composite entity for the purpose of having navigation lights. This means the lights displayed must represent the combined length and width of the entire unit, allowing other boat operators to make safe navigational decisions. The lights should indicate the overall dimensions and the orientation of the tow, which enhances situational awareness for nearby vessels.

The other options do not align with these navigation standards. Each barge having independent lights would create confusion regarding the actual size of the unit. Insisting that only the tugboat displays lights leaves the barges unidentifiable at night. Lastly, saying that the barges should not display any lights would violate safety regulations, neglecting the need for visible signals to prevent accidents or collisions in a marine environment.