The Vaisala AviMet® Runway Visual Range System (RVR) is a fully automated runway visual range assessment and reporting system for airports. It provides calculated estimation of the distance a pilot can see down a runway. Prevailing weather conditions (e.g. fog, rain, snow, etc.) have the most impact on RVR, but ambient light levels and runway light settings are also an important part of the equation.
The Vaisala AviMet® RVR system is fully configurable to cover airport needs of all ICAO categories from CAT I to CAT III.