"LOW VIS Proc In Effect"

[Lessnessman]

Hi, Question to ATC or Aviation Library Guru(s);

In order for Low Vis Procedures to be In effect, does the RWY/Aerodrome in question have to be Cat II Aerodrome or Better?

ie Some Aerodromes have all the ALS appropriate for Low VIS Take offs and Landing but NO RVR equip.

Does the RWY/Aerodrome have to have RVR transmissiometers for the RWY in Question?

With the said title of thread; what does that statement mean with regards to required aerodrome equipment in order to implement Low Vis Proc?

Please if possible provide CAA or Jepp. Airway Manual References..

Thanks in Advance..

Nessman