Impacts of Touch Screen Size, User Interface Design, and Subtask Boundaries on In-Car Task's Visual Demand and Driver Distraction

•In-car UI design factors’ visual distraction potential should be better understood•First study on UI features’ visual demand while controlling visual demands of driving•Automotive-targeted application decreases glance durations and visual distraction•Larger screen size has relatively small decreasing impact on glance durations•Subtask boundaries enable adjustment of glancing behavior in relation to driving situation•Visual demand of a task is not equal to visual distraction