The control theory of driving suggests that driver distraction can be analyzed as a breakdown of control at three levels. Common\r\napproach for analyzing distraction experimentally is to utilize capacity-based measures to assess distraction at the level of\r\noperational control. Three driving simulation experiments with 61 participants were organized to evaluate which kind of measures\r\ncould be used to analyze drivers� tactical visual sampling models and the related effects of distraction while searching textual\r\ninformation on in-car display. The effects of two different text types were evaluated. The utilized capacity-based measures seemed\r\nto be insufficient for revealing participants� tactical behaviors or effects of text type. The measures of workload or performance\r\ndid not indicate reliably the differences found between participants� visual sampling strategies or which text type is better for\r\nenabling safer task timing behaviors. Visual sampling measures did indicate effects of text type on participants� tactical abilities.\r\nDifferences in participants� visual sampling strategies leading to different levels of systematicity in visual behaviors can explain the\r\nvariances in visual sampling efficiency. Displays encouraging unsystematic glance allocation behaviors were found potentially the\r\nmost distracting in relation to safe visual sampling of in-vehicle displays.
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