Question 381Navigation General

The correct answer is B) the red light changes to green. The reasoning is that when a swing bridge is open for river traffic, the navigational lights on the bridge will show a steady red light when the bridge is closed to river traffic. When the bridge is open, the red light will change to a steady green light, indicating that the channel is clear and safe for vessels to pass through. The other options are incorrect because: A) a flashing green light indicates the bridge is closed, not open; C) the red light should not be extinguished when the bridge is open; and D) the amber light is not used for this purpose, the red light is what changes to green.