Destination entry while driving: The benefit of constrained options to act in multitask situations exemplified by two route guidance systems
In-vehicle information systems have to support time-sharing of visual attention and interrupted operation. We argue that these design needs are met by constrained options in interface dialogues. Task analyses and empirical data for manual destination entry functions of two route guidance systems are presented. The two systems differ with respect to the demands for visual attention and controlled processing. With one system, users have to decide among options during the entry dialogue, whereas with the other system destination entry proceeds in a single line of action. Data from a driving study and from three groups of different ages in training studies confirm the task analyses and show the benefit of constrained options.