Low Visibility Procedures are a set of procedures agreed between an aerodrome operator and ATC to support a desired movement rate in order that operations can continue safely. The procedures are then agreed with the Aerodrome Inspector (in the UK CAA SRG).
Although normally associated with Cat II/III they are not necessarily so. Basically the procedures are there to prevent unauthorised entry to the movement area, and in particular, inadvertent runway incursions.
I don't know about ICAO (it will be in Annex 14)but the UK procedures, in general, are in CAP168 Licensing of Aerodromes which is available here:
<a href="http://www.srg.caa.co.uk/pub/pub_publication.asp?Action=Cat&type=AED" target="_blank">http://www.srg.caa.co.uk/pub/pub_publication.asp?Action=Cat&type=AED</a>
It's a 2.8M file, I afraid. It's Appendix 2B you want.
HTH