Driving decisions based on traffic markers placed at acute-angled intersections are considered within the framework of the theory of signal detectability. The implied task requires a binary decision based on sensory information having some uncertainty and thus is amenable to analysis within this framework. The ability to separate the psychological and sensory components of performance can extend analyses from previous research with curved and flat markers. Data from prior laboratory studies rendered d' values of 1.08 and 2.25 for the flat and curved targets respectively, thus lending strong support to the hypothesis that slant is more accurately discriminated when a curved marker is viewed.
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