If RVR is reported as 6/6/6, what does each number indicate?

When RVR is reported as 6/6/6, each number represents the visibility measurement from three different transmissometers located along the runway. Specifically, the format indicates that all three readings are measuring a Runway Visual Range (RVR) of 600 meters.

This is crucial for pilots and air traffic controllers because RVR is a key factor in determining whether conditions are safe for landing or takeoff. The numbers provide an indication of how well the runway can be seen from the cockpit, which directly influences operational decisions regarding flight safety.

The other options do not accurately reflect what the 6/6/6 report signifies. For example, the mention of runway width or minimum visibility distances would not pertain to the RVR assessment and could lead to misunderstandings in interpreting critical flight safety data.