Final answer:
Low-visibility protocols are implemented when RVR is less than 1200 to minimize vehicle movement near aircraft, involving various safety measures to ensure airfield operational safety.
Step-by-step explanation:
When the Runway Visual Range (RVR) on the airfield is less than RVR 1200, the special procedures that are put into place to minimize the movement of vehicles near aircraft on the movement area are known as Low-visibility protocols. These protocols include various measures to ensure the safety of both aircraft and ground operations under reduced visibility conditions. These can involve restricting the access of vehicles to certain areas, limiting the number of vehicles allowed on the movement area, enhancing communication between vehicle operators and air traffic control, as well as utilizing high-visibility markings and lights on vehicles.
Low-visibility protocols are essential to maintain operational safety standards and prevent accidents, as they reduce the risk of vehicles inadvertently entering active runways or interfering with aircraft operations during times of poor visibility. Compliance with these protocols ensures the smooth and safe operation of the airfield.