Driver impairment as a result of attention-related factors is a common concern to many areas of safety research in driving. Previously, the “coherence technique” was developed to provide several metrics of performance in relation to the continuous task of car following presumed to require vigilance and perceptual capacity (Brookhuis, De Waard, & Mulder, 1994). This study examines a modified version of this technique that is more natural. This modified technique was sensitive to both increased primary and secondary (distraction) task load.
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