Red-red-green:
No, it's not a new air traffic control light-gun signal. It's the laser signal
you'll get if you violate the sensitive airspace around the nation's capital.
So
before flying near Washington, D.C., take the AOPA Air Safety Foundation's
fast-paced, four-minute "Visual
Warning System" minicourse. It explains how the tightly focused
laser-warning system locks on an aircraft that has strayed too close to the
Washington, D.C., Air Defense Identification Zone (ADIZ).
Watch actual video footage of the light signals as seen from a general aviation cockpit, and learn what to do if you get caught in the high-intensity beams.