![]() ![]() ![]() THLs are installed along runway centerlines, and they illuminate in red to indicate to a pilot about to take off that another airplane or a vehicle has encroached on the runway. RELs are installed in the pavement where taxiways intersect with runways, and they illuminate in red to indicate to a taxiing pilot that an airplane is approaching or the runway is occupied by another airplane. They function automatically and are independent of air traffic control. RWSL systems consist of two types of lights-Runway Entrance Lights (REL) and Takeoff Hold Lights (THL). The lights work pretty well but do they work well enough? ![]() One of the tools the FAA has developed to mitigate the risk is the Runway Status Light (RWSL) system. Sometimes two airplanes or an airplane and a vehicle wind up at almost the same spot on a runway even when their radio transmissions are clear. That would lessen one of the risks that cause incursions, but there are other risks as well. I suggested the FAA require anti-blocking circuits in ATC and aircraft radios to prevent some runway incursions. I have written previously that improvements to tools, staffing and work environments would help mitigate runway incursions. ![]()
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