PROCEEDINGS of the HUMAN FACTORS AND ERGONOMICS SOCIETY 48 th ANNUAL MEETING – 2004 FOCAL AND AMBIENT VISUAL CONTRIBUTIONS AND DRIVER VISUAL SCANNING IN LANE KEEPING AND HAZARD DETECTION

In some previous simulator studies, we showed that drivers, engaged in a secondary in-vehicle task at different display separations, were able to buffer some aspects of the driving task (e.g., vehicle control), but not others (e.g., hazard response; Horrey & Wickens, 2002, Horrey, Alexander, & Wickens, 2003). We speculate that this pattern of results may be a result of effective time-sharing between the ambient visual task of vehicle control and the focal visual in-vehicle task, but task interference between the in-vehicle task and the focal task of hazard detection and identification. Alternatively, drivers may be using an optimal scanning strategy that allows them to effectively monitor both the roadway and the in-vehicle device. In this paper, we detail some of the theoretical background, describe some relevant research, and present a model of scanning behavior.

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