The aim of the study was to identify the determinants of conflict risk judgments in air traffic control. Fourteen expert controllers made conflict risk judgments about air traffic situations in which three variables (conflict geometry, time of closest point of approach or TCPA, and vertical separation between aircraft) were manipulated. The results indicate that conflict geometry, TCPA, and the vertical separation between aircraft significantly influenced judgments of conflict risk. In addition, there was a significant interaction between these three variables. Risk perception was largest under conditions where aircraft were on the same headings, with short TCPA, and no minimum vertical separation. The study was successful in determining what factors of air traffic scenarios increased subjective risk judgments in air traffic control.
& Loft, S.
(2009). Determinants of Conflict Risk Judgments in Air Traffic Control. 2009 International Symposium on Aviation Psychology, 672-677.