Aircraft (with over 9 passengers) are required to have TCAS[0]. TCAS issues a resolution advisory if conflicting traffic is detected, and if the approaching air

Aircraft (with over 9 passengers) are required to have TCAS[0]. TCAS issues a resolution advisory if conflicting traffic is detected, and if the approaching aircraft also maneuvers, TCAS can issue a "Reversal" if needed. Airport Runways have typically have edge lighting, and if an aircraft is off-center during takeoff or landing, can hit them and do damage[1]. Airliners land at 150mph+ so it doesn't take much deviation to hit the edge lights. Occasionally, this also happens during a gusty cross-wind landing while coupled to autopilot (auto-land), or immediately after a touchdown after a coupled landing. [0] https://en.wikipedia.org/wiki/Traffic_collision_avoidance_system https://en.wikipedia.org/wiki/Traffic_collision_avoidance_sy... [1] http://www.emirates247.com/news/emirates/etihad-plane-hits-runway-lights-amid-zero-visibility-in-abu-dhabi-2012-01-31-1.440326 http://www.emirates247.com/news/emirates/etihad-plane-hits-r...