Expanding on the info I provided in my post #149, here are some excerpts from the KLAX SMGCS plan (still can’t find the KAUS SMGCS plan online, but such a plan must exist).
Activation
SMGCS procedures shall be activated by LAX ATCT when any one RVR value per airport south and/or north complex is between 1200 feet to 500 feet.
ATC
When RVR values are 4000 feet or less, shall begin monitoring the Category II/III system remotely.
Broadcast on the ATIS that SMGCS operations are in effect.
Airport Ops
Continuously monitor all aircraft movement area lighting and signage.
Protect ILS RWY critical areas.
Aircraft Operators
Pilots conducting low visibility operations at LAX are required to have a copy of the low visibility taxi route chart.