Question 3 MODU02 - Barge Supervisor

The Correct Answer is A **Why Option A ("A law enforcement vessel") is correct:** Under the Inland Waterways Rule 21(e) (Lights for Law Enforcement Vessels), a law enforcement vessel may display a flashing blue light when engaged in official duties. This light is intended to signal the vessel's identity and function, particularly when attempting to make contact with or stop another vessel, or when performing other regulatory duties. This signal is unique to law enforcement under the Inland Rules. **Why Option B ("A work boat") is incorrect:** A work boat (or a vessel engaged in dredging or underwater operations) typically displays lights related to restricted maneuverability, such as red-white-red vertical lights, or signals related to obstructing the channel, but not a flashing blue light. **Why Option C ("A vessel engaged in a race") is incorrect:** Vessels engaged in a race do not have a specific navigational light signal (such as a flashing blue light) mandated by the Rules of the Road solely for indicating their participation in a race. Their light requirements would typically follow those of a sailing vessel or power-driven vessel, depending on their type. **Why Option D ("A vessel transferring hazardous cargo") is incorrect:** Vessels carrying or transferring hazardous cargo do not use a flashing blue light as an identifying signal under the Rules of the Road. They are typically identified by the display of specific day shapes (e.g., a B-flag) or compliance with specific regulations concerning restricted visibility, but not the flashing blue light.