What does RVR stand for in aviation?

RVR stands for Runway Visual Range, which is a crucial measurement in aviation that indicates the distance a pilot can see down the runway. It is essential for determining whether the visibility conditions meet the minimum requirements for takeoff and landing. RVR is typically expressed in meters or feet and is derived from measurements taken by transmissometers located along the runway, helping flight crews make informed decisions regarding visibility during operations in various weather conditions, especially during low visibility situations such as fog, rain, or snow.

While the other options may seem reasonable, they do not accurately capture the established terminology used in aviation. For example, "Runway visibility report" and "Runway variable report" imply a focus on reporting without specifying the measurable range of visibility, and "Runway velocity range" introduces an incorrect concept that pertains to speed rather than visibility parameters. Thus, understanding that RVR refers specifically to the visual range is key to grasping its importance in aviation safety and operations.