What does the term visibility denote?

Visibility refers to the ability to see and identify objects at a certain distance. Specifically, it denotes the distance at which specific, recognizable objects—such as landmarks, signs, or buildings—can be seen clearly. This is an important aspect of meteorology, as it helps to determine safe travel conditions and affects various modes of transportation, particularly aviation.

While options discussing distance in kilometers or miles may seem relevant, visibility is primarily focused on the identification of objects rather than a simple measurement of distance alone. Furthermore, total distance in one direction does not capture the essential aspect of being able to recognize those objects. In short, visibility encompasses more than just how far one can see; it specifically includes the clarity and recognizability of the objects being observed.