Which of the following are true regarding RVR reports?

The statement indicating that the prevailing visibility is 1 statute mile or less correctly identifies a critical condition that warrants RVR (Runway Visual Range) reports. RVR is specifically utilized to provide pilots and air traffic controllers with an accurate assessment of visibility conditions along a runway during low visibility situations, such as fog or heavy precipitation.

When the visibility falls to 1 statute mile or less, it is essential to report RVR because this can significantly affect takeoff and landing operations. RVR readings become particularly important for instrument flight rules (IFR) operations where precise visibility measurements are crucial for maintaining safety in flight operations.

The other choices, while related to RVR, either describe conditions that are not accurate interpretations of RVR's significance or related reporting structures. Understanding these nuances is important for any weather observer or pilot in interpreting RVR reports.