What does RVR stand for in aviation?

RVR stands for Runway Visual Range, which is a critical measurement used in aviation to assess the visibility conditions at a runway. It indicates the distance a pilot can see down the runway and is specifically useful during takeoff and landing operations, especially in low-visibility situations such as fog, rain, or snow.

The measurement is taken using instruments that determine the distance at which a pilot can see the runway surface markings or lights. This information helps pilots make informed decisions regarding whether it is safe to proceed with landing or takeoff based on current visibility standards required for different categories of flight operations.

In this context, the other options do not accurately capture the specific aviation term. For instance, while "Runway Visibility Report" could imply a report on runway conditions, it is not the recognized standard term used in aviation for visibility. "Relative Visibility Range" and "Radar Visual Reference" do not pertain to the defined measurement of visibility related to runways. Therefore, the correct term, Runway Visual Range, is essential for maintaining safety and operational standards in aviation.