What does the term 'restricted visibility' refer to?

The term 'restricted visibility' specifically refers to situations where obstacles like fog, mist, falling snow, heavy rain, sandstorms, or similar weather phenomena limit the distance a person can see. This is particularly relevant in navigation and maritime operations, as restricted visibility presents challenges for safe vessel operation and maneuvering. Navigators must be aware of these conditions because they significantly affect a vessel's ability to detect other vessels, markers, and geographical features. Recognizing restricted visibility is essential for maintaining safety and adhering to navigational rules during such conditions.

The other options do not accurately describe restricted visibility. Conditions causing total darkness do not fall under the category of visibility that's just restricted; they represent an entirely different scenario. Weather events that decrease temperature may not necessarily impact visibility at all. Lastly, while land formations can obscure navigation, this is not what restricted visibility signifies, as it pertains to atmospheric conditions.