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The cockpit display of traffic information (CDTI) enhanced flight rules (CEFR) application is an extension of the current visual separation procedure used by ATC. In this application, the flight crew is authorized to use the CDTI in lieu of out-the-window visual contact of an aircraft during visual and instrument approaches. This research is being conducted as part of the Federal Aviation Administration's (FAA's) safe flight 21 program. The initial implementation will require the flight crew to establish visual contact with the traffic to follow prior to losing sight of the aircraft (due to a visibility restricting condition such as a cloud layer or haze). During the period of visual obscuration, the pilot will use CDTI to maintain awareness of the relative position and speed of other traffic. After passing through the visibility restricting condition, and prior to landing, the flight crew will use the CDTI to assist in re-establishing out-the-window visual contact. The CDTI will also be used to initially detect, monitor, and reacquire the traffic to follow more effectively.