It is strange to have Viz more than RVR as it should be the other way round
It is frequently the case that Met vis will be greater than RVR. Met vis is the prevailing visibility in a 360 degree arc around the observation point (ie the vis that is most prevalent in greater than 50% of the local atmosphere.)
At my airport the runway sits next to a river and so can be prone to shallow fog on the runway at dawn but the rest of the airport remains gin clear. Trust me we find it a PITA too. What should be being reported though is fog patches, fog banks, shallow fog or a reduced vis in a particular direction Provided it is BOTH less than 10km and less than half of the prevailing vis), together with any IRVR readings.
It would make more sense to me to disseminate an operational visibility and on occasion I have been known to sway my observations to this criteria. Ssssh.