Previous studies have shown that cognitive tunneling can be reduced when the Head-up Display (HUD) image is not placed directly in the central vision area but rather a few degrees off center. The theory is that angular eye movement acts as a trigger to allow the brain to separate from the information that the driver does not want to focus on at that time. This paper tests an ancillary hypothesis that locating the HUD image at a different focal distance than the road scene has a similar effect, i.e., changes in eye focus can have a similar trigger affect. This study compares 12 subjects ranging in age from 17 to 49. A video of a car from the passenger’s perspective is used to simulate the external environment. While viewing the scene, the subjects must simultaneously monitor speed and detect objects of interest on the road. Speed is located at various image distance to identify performance differences related to focal distances.
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