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TAKEOFF HOLD LIGHTS
The TAKEOFF HOLD LIGHT (THL) system is composed of in pavement lighting in a double, longitudinal row of lights aligned either side of the runway centerline. The lights are focused toward the arrival end of the runway at the line up and wait point, and they extend for 1,500 feet in front of the holding aircraft. Illuminated red lights indicate to an aircraft in position for takeoff or rolling that it is unsafe to takeoff because the runway is occupied or about to be occupied by an aircraft or vehicle.
source: FAA Pilot/Controller Glossary
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