clear for landing or takeoff.
stop or give way.
If the aircraft is in flight, a steady green light signal from the control tower means cleared to land. If the aircraft is on the ground, it means cleared for takeoff. If the light is aimed at ground vehicles or foot traffic, steady green means cleared to cross the runway, or proceed.
warning- use caution
clear for taxi or return to land
taxi clear of runway or do not land.
return to ramp
If you mean the light gun signals from the control tower- to vehicles, and aircraft on the ground, get off the runway. For aircraft in flight, runway is unsafe, do not land.
stop: clear the active runway
A red light - steady or flashing - means STOP. A steady amber light means Caution - signal about to change. A flashing amber light means SLOW DOWN.
On traffic lights it means slow down.
You cannot drive in this lane.
Power supply or motherboard is bad.