INLAND ONLY While underway at night, you see two yellow lights displayed in a vertical line. What do the lights indicate to you?

Correct Answer: Option D — vessel pushing ahead

33 CFR 84.15 (Inland Rule 24) specifies that a power-driven vessel pushing ahead or towing alongside shall exhibit two yellow lights in a vertical line. This signal is unique to Inland waters and identifies the vessel as part of a composite unit or pushing a tow.