Abstract
High driver workload has been considered as a risk factor in motor vehicle crashes. To minimize the number of crashes and improve driving safety, it is necessary to investigate driver workload and the most influential factor that affects driver workload. In this study, we examined the effects of road geometry, driving performance (by both steering wheel and pedal controls), and secondary task modality type on driver workload. A hierarchical ordinary least squares multiple regression analysis revealed that visually demanding secondary task predicted higher driver workload. This finding could help in-vehicle interface designs to minimize driver workload and improve driving safety.
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