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Exercise extreme caution.
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.
clear the active runway
Clear active runway
If your aircraft is on the ground, a steady red light from the control tower light gun means STOP. If you are airborne, a steady red light means to give way to other aircraft, and continue circling.
In aviation, flashing red means get of the runway if you are on the ground and it means the airport is not safe for landing if you are in the air.
Return to Starting Point on Airport
A flashing amber light means approach the lock at a safe speed and under full control.
Flashing RED: clear the active runway. Flashing RED AND GREEN: General Warning: Exercise extreme caution.
In the U.S.A it means you have the right of way but proceed with caution.
It means you should slow down and be prepared to stop if necessary. "Slow down and cross the intersection carefully."
Usually means the bulb is out. Turn on the turn signal then go out and see if the signal light is flashing.