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 Color and
Type of Signal

 Movement
of Vehicles,
Equipment
and Personnel

 Aircraft on
the Ground

 Aircraft
in Flight

 Steady Green

Cleared to cross,
proceed or go

 Cleared for takeoff

 Cleared to land

 Flashing Green

Not applicable

Cleared for taxi

 Return for landing
(followed by
steady green)

 Steady Red

STOP

STOP

Give way to
other aircraft and
continue circling

Flashing Red

Clear the
taxiway/runway

Taxi clear of the runway in use

Airport unsafe,
do not land

 Flashing White

Return to starting
point on airport

Return to starting point on airport

 Not applicable

Alternating Red
and Green

Exercise
Extreme Caution

Exercise
Extreme Caution

 Exercise
Extreme Caution