F.A.A. Wants Stoplights Added to Runways
The Federal Aviation Administration will add a runway version of traffic signals at 20 busy airports in the next three and a half years, the agency said Monday. The signals are part of a program to keep taxiing airplanes or vehicles from intruding on runways where other planes are taking off and landing.
http://www.nytimes.com/2008/03/26/bu.../26runway.html