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    Area of Science:

    • Human-Computer Interaction
    • Automotive Safety
    • Haptic Feedback

    Background:

    • Vibrotactile collision warnings simulating linear motion enhance driver brake reaction times (BRTs).
    • Previous research has not explored vibrotactile patterns beyond linear motion simulation for collision warnings.

    Purpose of the Study:

    • To investigate the effectiveness of vibrotactile flow patterns as collision warnings.
    • To compare vibrotactile flow warnings with static and no-warning conditions.
    • To compare vibrotactile flow warnings with linear motion warnings.

    Main Methods:

    • Experiment 1: Compared expanding/contracting vibrotactile flow, static, and no-warning conditions in a car-following scenario.
    • Experiment 2: Compared linear motion warnings with expanding vibrotactile flow warnings.

    Main Results:

    • Both expanding and contracting vibrotactile flow warnings significantly reduced BRTs compared to static and no-warning conditions.
    • No significant difference was found between contracting and expanding vibrotactile flow warnings.
    • Linear motion warnings resulted in significantly faster BRTs than expanding vibrotactile flow warnings.

    Conclusions:

    • Vibrotactile flow warnings are effective in informing drivers of potential collision events.
    • Vibrotactile warnings simulating linear motion may be more effective than vibrotactile flow warnings for enhancing BRTs.