Runway visual range

A pilot's view of Lisbon Airport's runway 21 in fog; runway visual range is about 200 m (660 ft)

In aviation, the runway visual range (RVR) is the distance over which a pilot of an aircraft on the centreline of the runway can see the runway surface markings delineating the runway or the lights delineating the runway or identifying its centre line. RVR is normally expressed in meters or feet. RVR is used to determine the landing and takeoff conditions for aircraft pilots, as well as the type of operational visual aids used at the airport.[1]

  1. ^ Wragg, David W. (1973). A Dictionary of Aviation (first ed.). Osprey. p. 226. ISBN 9780850451634.