And for LVO takeoff, the reported RVR (if too low) may be replaced by pilot assessment - count the lights (as long as you know what their spacing is). RVR is only an approximation of the vis along the runway as IRVR is measured by transmissometers that legally are required to be about 100 m from the runway centreline. As we all know who operate in Europe, fog is anything but uniform in its density.
Bring back the guy on top of the truck doing a manual RVR check!