How does RVR differ from general visibility?

RVR, or Runway Visual Range, specifically quantifies the distance a pilot can see down the runway, which is critical for takeoffs and landings. This measurement is instrumental in assessing the conditions for safety during flight operations, particularly in low visibility scenarios. Unlike general visibility, which can be influenced by environmental factors like obstructions and weather conditions over a broader area, RVR provides a more localized assessment that pertains directly to the runway environment.

This localized focus allows for a precise understanding of the visual conditions a pilot can expect when beginning a landing approach or taking off, ensuring they make informed decisions based on reliable data. By measuring runway visual range directly, this provides pilots with actionable information tailored for their immediate operational environment.