Air Traffic Control Tower Light Gun Signals
Meaning
Color and Type of Signal
Movement of Vehicles,
Equipment and Personnel
Aircraft on the
Ground
Aircraft in Flight
Cleared to cross, proceed or go
Cleared for
takeoff
Cleared to land
Not applicable
Cleared for taxi
STOP
STOP
Steady Green
Flashing Green
Steady Red
Flashing Red
Flashing white
Alternating Red and
Green
Taxi clear of the
runway in use
Return to starting
Return to starting point on airport
point on airport
Clear the taxiway/runway
Exercise extreme caution
Exercise extreme
caution
Return for landing (to be followed by
steady green at the proper time)
Give way to other aircraft and continue
circling
Airport unsafe, do not land
Not applicable
Exercise extreme caution