Amornrat Chumsai Na Ayutthaya, Director of Chiang Mai International Airport has said that while Chiang Mai’s runway visual range (RVR) is currently at between 3,000-5,000 metres, which is not yet considered to be labelled low-visibility, authorities are currently practicing and training for the eventuality of possible low-visibility. This includes trial-runs for low visibility from 800 metres as