warning- use caution
clear for landing or takeoff.
clear for taxi or return to land
taxi clear of runway or do not land.
return to ramp
stop or give way.
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
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.
It means get off the runway now, or, if flying, do not land here.
A red blinking light on the runway typically indicates that the area is unsafe for landing or takeoff, often signaling to pilots to hold or divert. It can also be a warning for obstacles or hazards on the runway. Pilots are trained to respond to such signals by maintaining altitude and avoiding the area until it is deemed safe.
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Blue what ? ! ? Do you mean an object that appears blue in white light ? Such an object appears black in green light.