What should happen if RVRs fall below 600?

When runway visual range (RVR) falls below 600 meters, the appropriate action is to cease all operations on that runway. This is due to the fact that an RVR reading below 600 meters indicates significantly reduced visibility, which poses safety risks for aircraft landings and takeoffs. At this level of visibility, pilots may not be able to safely navigate or control the aircraft during critical phases of flight, such as landing and departure.

Ceasing all operations ensures that the air traffic control can manage air traffic safely and provides the opportunity for necessary precautions to be taken until visibility improves. It helps prevent dangerous situations, such as runway incursions or collisions, by ensuring that no aircraft are attempting to land or take off in conditions where they cannot see the runway clearly.

This protocol aligns with safety regulations and best practices that prioritize the safety of both the aircraft and the airport environment. Maintaining a high level of safety is paramount, and operating in conditions of low visibility contradicts that objective.