Question 386 Rules of the Road

The correct answer is B) a flashing blue light. According to the United States Coast Guard regulations, the use of a flashing blue light is permitted only for law enforcement vessels. This distinctive light helps other vessels quickly identify these official vessels and take appropriate actions, such as yielding the right-of-way. The other answer choices, such as a flashing yellow light, an alternately flashing red and yellow light, or two red lights in a vertical line, are not authorized for law enforcement vessels under the Coast Guard's guidelines for inland waterways.