Question 29 RVR02 - Master of LT 500-1600 GRT

The Correct Answer is B **Explanation for Option B (alternately flashing red and yellow light):** Option B, an alternately flashing red and yellow light, is the specific light authorized under **Inland Navigation Rules, Annex V, Rule 88** (or variations thereof, often related to state or local regulations governing public safety/emergency vessels). This light signal is designated for non-federal, state, or local government commercial vessels when they are engaged in public safety activities, such as fire fighting, search and rescue, or other law enforcement duties, especially on U.S. inland waters. It serves as a warning signal indicating that the vessel is involved in an official emergency or safety activity and other vessels should operate with caution. **Why the other options are incorrect:** * **A) flashing yellow light:** A single flashing yellow (or amber) light is typically designated for vessels operating under tow, or in some jurisdictions, for certain limited-service vessels, but it is not the standard warning signal for general public safety activities in distress/emergency situations. * **C) alternately flashing blue and red light:** This light configuration is commonly associated with highway emergency vehicles (police, fire, EMS) but is generally **not** the standard designated light pattern for public safety vessels on U.S. navigable waterways (Inland Rules). Marine rules specify the red and yellow combination for this purpose. * **D) flashing blue light:** A single flashing blue light is specifically reserved for **law enforcement vessels** (federal, state, or local) and indicates the vessel is engaged in enforcement duties. While public safety activities can include law enforcement, the general operational definition for broader public safety activities (e.g., fire, rescue) that may involve commercial vessels often requires the red and yellow combination.