Solar Barricade Lights In Airports

If you see solar barricade lights, that is lights that attach to either a barricade, traffic drum, or airport barricade, and they are in an airport, chances are they are red.  It is required by the FAA that these lights are red.

If you are on the road, you will see these lights in yellow most of the time.  You may occasionally find them in red or blue, but blue is more common on railroads and like mentioned earlier, red is usually found in airports.