It is supposed that a driver engages in controlled processing in emergencies and automatic processing in ordinary driving situations. This study sought to clarify the impacts of in-vehicle visual-manual (VM) and voice-control (VC) tasks on driving behavior. Experiment results revealed that ordinary driving behavior was affected by VM and VC tasks. In contrast,
avoidance behavior in emergencies was influenced by only VM task differences. The results were discussed from the viewpoint of the interference between visual inputs and cognitive loads among tasks and driving situations.