RVR is a measurament of the visual range at a point. It is not directional. i.e. RVR is a measurament of the visual range at a point. It is not directional. i.e. the RVR can be different as soon as one moves away from that point in any direction.
Therefore, [QUOTE]...the RVR can be different as soon as one moves away from that point in any direction.
It then follows that an RVR for one runway cannot be substitued for
another runway, just for convenience.
Look on the approach chart.
Is an RVR value specified?
If so, it is controlling.
If not, one cannot subsitute some other RVR from any other runway...and yes, even one from the same runway, but in the opposite direction.
In addition, RVR is normally referenced to the runway light setting, and many runway lights are not uni-directional.