Fact Sheet

Runway Status Lights

The FAA is testing and deploying a runway warning system called Runway Status Lights (RWSL). This is the first system that gives direct warning to pilots of potential runway incursions or collisions.

What it Does

RWSLs warn pilots when it is unsafe to cross, enter or begin takeoff on a runway via a series of red lights embedded in the pavement. Studies have shown that RWSL provides optimal defense against 65 percent of the high-hazard runway conflicts without adversely impacting runway capacity or controller workload. Additionally, initial field evaluations showed 70 percent runway incursion reduction on a runway equipped with RWSL.

How it Works

Pilots approaching a runway see red lights illuminate if the airport’s ground surveillance radar — either Airport Surface Detection Equipment Model 3 (ASDE-3) or ASDE-X — detects traffic on or approaching that same runway. Pilots must stop when they see the red lights. Clearance to cross or enter a runway must be given by air traffic control. After the lights go off the pilot must verify clearance before proceeding. RWSLs will also be used by vehicle operators.

Runway entrance lights are illuminated if a runway is unsafe for entry or crossing. Red takeoff hold lights are illuminated if the runway is unsafe for departure.

Where it’s Being Tested

Runway Status Lights are being tested at Dallas/Ft. Worth, San Diego and Los Angeles. Testing at LAX began in April.

Status

The FAA also plans to deploy Runway Status Lights at the following airports by 2011: Atlanta, Baltimore Washington International, Boston, Charlotte, Chicago O’Hare, Denver, Detroit, Washington Dulles, Fort Lauderdale, Houston Intercontinental, New York John F. Kennedy and La Guardia, Las Vegas, Minneapolis, Newark, Orlando, Philadelphia, Phoenix and Seattle.