Under what RVR does SMGCS go into effect?

• A. 600 RVR
• B. 1800 RVR
• C. 1000 RVR
• D. 1200 RVR

Answer: (D)

SMGCS is activated when surface visibility falls to a level where standard ground control can no longer safely manage taxiing and movements on the airfield. At that point, enhanced guidance and coordination are put in place—defined taxi routes, closer monitoring by ground controllers, more precise clearance instructions, and heightened situational awareness to prevent runway or taxiway incursions.

Among the given options, the threshold that marks the onset of SMGCS is the lower end of the visibility values. Values higher than that threshold mean conditions are still manageable with normal surface operations, while more restrictive conditions fall under other procedures. So the trigger is the lower-visibility level among the choices, which is why that option best represents when SMGCS goes into effect.