What does 'visibility equal or greater than 10km' indicate in aviation?

The phrase 'visibility equal or greater than 10km' indicates that visibility is clear enough for safe flight operations, aligning closely with what is defined as CAVOK (Ceiling And Visibility OK) conditions in aviation. CAVOK is a term used in meteorology to specify that visibility is good, meaning 10 kilometers or more, and there are no significant weather conditions affecting a flight except for clouds that are no lower than 5,000 feet above the ground or above the highest terrain in the area.

When visibility meets or exceeds 10 kilometers, pilots are assured that they can safely navigate without the risk of encountering issues that lower visibility might introduce. This condition elicits confidence in maintaining visual flight rules (VFR) and does not involve low-visibility complications, thereby contributing to a safer flying environment. In this sense, this choice is the most accurate representation of what such visibility conditions signify in aviation.