Thanks Jason. So does this mean the pilot can expect to visually pick up the runway at 5000ft if the RVR (not RDR, my bad, and thanks for not pointing that out) is 5000?
Usually the answer is yes, but not always since the touchdown RVR is technically measured at the touchdown zone and not prior to it (where the DA/MDA is reached); however, the flight crew must have the prescribed flight
visibility for the specific approach they are flying before descending below the DA or MDA.
Here's a good description from the December 1996 issue of IFR Refresher
RVR is defined in FAR Part 1 as, "...runway visual range as measured in the touchdown zone area." The definition doesn't use the word "visibility." RVR is NOT visibility. RVR is the measurement of the distance at which the pilot is likely to be able to see the high intensity runway lights (HIRLs) once the aircraft has touched down on the runway surface in the runway's touchdown zone.