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Reference.org
Runway incursion
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<p>A runway incursion is an <a href="/facts/Aviation_accidents_and_incidents/l9JPLGqN">aviation incident</a> involving improper positioning of vehicles or people on any <a href="/facts/Runway/EYy72SPJ">airport runway</a> or its <a href="/facts/Critical_area_(aeronautics)/aNGAuxLH">protected area</a>. When an incursion involves an <i>active</i> runway being used by arriving or departing aircraft, the potential for a collision hazard or <a href="/facts/Instrument_landing_system/CTLARvA8">instrument landing system (ILS)</a> interference can exist. At present, various <a href="/facts/Runway_safety/dattHSFt">runway safety</a> technologies and processes are commonly employed to reduce the risk and potential consequences of such an event. </p>