[Ref VFRG, Air Pilot’s Manual 1-Flying P.242]

Green 

On ground  – Authorised to take off

In flight – Authorised to land

Flashing Green 

On ground  – Authorised to taxi

In flight – Return for landing

 

Red

On ground  – STOP

In flight – Give way to other aircraft Continue circling

Flashing Red

On ground  – Taxi clear of landing area In use

In flight – Do not land Aerodrome unsafe

 

Flashing White 

On ground – Return to starting point on aerodrome