What does MID stand for in RVR reporting?

• A. Midpoint; visibility at the runway's midpoint
• B. Mechanical interlock device
• C. Minimum instrument data
• D. Meteorological information division

Answer: (D)

In RVR reporting, MID refers to the midpoint of the runway and is the value reported for visibility at roughly the center portion of the runway. RVR data for a runway can be given for three segments—touchdown zone (near the threshold), midpoint (about the middle of the runway), and rollout (near the far end). The MID reading tells you how far you can see around the middle of the runway, which helps reflect any variation in visibility along the runway length. The other options don’t relate to runway visibility measurements—the term MID is not a mechanical device, instrument data, or a meteorological information division. The MID value is simply the visibility measured at the runway’s midpoint.