Interactions between human-human multi-threaded dialogues and driving

In-car devices with speech user interfaces are proliferating. How can we build these interfaces such that they allow human-computer interactions with multiple devices to overlap in time, but without interfering with the driving task? We suggest that interface design can be inspired by the way people deal with this problem in human-human dialogues and propose discovering human dialogue behaviors of interest through experiments. In this paper, we discuss how to design an appropriate human-human dialogue scenario for such experiments. We also report on one human-human experiment, in terms of the dialogue behaviors found, and impact on the verbal tasks and on driving. We also offer design considerations based on the results of the study.