Which of the following is true about Low Visibility Operations (LVOP)?

Low Visibility Operations (LVOP) are defined by specific visibility criteria which directly impact aviation safety and operational procedures at an airport. The correct understanding of LVOP is crucial for safely managing airside operations.

The scenario described recognizes LVOP as occurring when runway visibility is between 1200 feet and 600 feet. This range signifies conditions where visibility is significantly reduced, necessitating additional protocols to ensure the safety of all operations on the airfield. During these conditions, special procedures are implemented for pilots and ground vehicles to minimize risks such as runway incursions or collisions.

In contrast, the other statements do not accurately reflect the nature of LVOP. For example, visibility exceeding 1200 feet does not fall under LVOP regulations and does not require the specific operational considerations that apply when visibility drops below this threshold. Complete closure of the runway is not necessary during LVOP; rather, it allows for a controlled operation under prescribed guidelines. Lastly, unrestricted movement of all vehicles would pose a significant risk in reduced visibility conditions, thus it's not a characteristic of LVOP.

Therefore, recognizing that LVOP specifically operates within the defined visibility thresholds is critical for ensuring safe airside operations.