| Runway Visual Range - An instrumentally derived value, based on standard callibrations, that represents the horizontal distance a pilot will see down the runway from the approach end: it is based on the sighting of either high intensity runway lights or on the visual contrast of other targets - whichever yields the greather visual range. RVR, in contrast to prevailing or runway visibility, is based on what a pilot in a moving aircraft should see looking down the runway. RVR is horizontal, AND NOT SLANT, visual range. It is based on the measurement of a transmissiometer made near the touchdown point of the instrument runway and is REPORTED IN HUNDERDS OF FEET. RVR provides an additional operating minimum at fields equiped with specified navigational aids. For example, at the present time the RVR minimum at Newark is 2000 ft [in combitation with a decision height (DH) of 218 MSL] for both takeoffs and landings regardlessof the reported ceiling and visibility.
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