Investigating Redundant Multimodal Speedometer Displays for Supporting Concurrent Lane and Speed Tracking
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Driving heavily requires visual processing resources. This study seeks to investigate the effectiveness of novel speedometer displays that offload the visual channel by encoding speed data in auditory and tactile presentations. Building on previous work, this study specifically examined dimensional effects in these displays to see whether simple or redundantly-encoded displays were better for supporting multitask performance. Four displays relayed information about current vehicle speed relative to a target speed and performance effects in concurrent lane-tracking and speed-tracking tasks were compared. The experimental results showed that the spatial location dimension in both modalities significantly improved the speed-tracking performance and also the total performance; whereas the displays with redundant beat patterns did not further improve performance beyond the spatial displays. An understanding of the dimensional effects provides better support the design of multimodal display for multi-tracking performance in driving scenarios and other domains.
