Exercise extreme caution.
It means get off the runway now, or, if flying, do not land here.
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.
Congratulations! You have a virus. (:
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.
The power supply unit must be toasted.
It is a warning light to pilots in poor visibility that there is a tall building there
Red=stop red flashing= light is broken, use your judgement in crossing.
When the Control Tower activates the red lights, vehiclesmust stop at marked locations until the light returns to green
Reference: 7110.65T Air Traffic Control Manual for an aircraft on the ground: Taxi clear of landing area or runway in use for aircraft in the air: Airport unsafe- Do not land for vehicles on the ground: Clear the taxiway/runway
A flashing red traffic light is used the same way as a stop sign. You treat a flashing red traffic light the same way you do as a stop sign. If the traffic light is "blacked-out", it's to be treated as an all-way stop. What I do when I come up to a flashing red traffic light, I look at the cross-traffic signals to see if they're also flashing red, or if they're flashing yellow to see if they stop or if they don't stop.
A red flashing light on a Droid usually means that your phone has 15% or less battery left and is about to die!