What indication is given for runway visual range (RVR) when a station does not have RVR equipment?

The indication for runway visual range (RVR) when a station does not have RVR equipment is that no RVR is coded. This means that if the specific equipment to measure RVR is not available at the airport or weather station, there will simply be no reported RVR value. RVR is critical for determining the visibility conditions that pilots need for safe takeoff and landing, and without the necessary instruments to measure it, the data cannot be provided.

In contrast, visibility estimations, alternative measurements, or approximations would imply that there is some form of data being reported despite the lack of direct measurements. However, in the absence of RVR equipment, the standard protocol is to omit any RVR coding entirely to maintain accuracy in weather reporting. This ensures that pilots and air traffic control have a clear understanding of what is known and what remains unknown regarding the runway conditions.