On-Road Evaluation of In-vehicle Interface Characteristics and Their Effects on Performance of Visual Detection on the Road and Manual Entry
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Summary
This study investigates how in-vehicle interface characteristics, specifically feedback modality and key size, affect drivers’ multitasking performance and visual attention management. As automakers increasingly replace physical controls with touchscreens, there is concern that the lack of naturalistic nonvisual cues (such as tactile resistance or auditory clicks) forces drivers to rely more heavily on vision, thereby increasing distraction and time with eyes off the road. The research aimed to determine whether synthetic nonvisual feedback (auditory and vibrotactile) could mitigate these safety risks by supporting visual awareness of the roadway during secondary tasks. The experiment involved 29 participants driving an instrumented vehicle on a closed course while performing two concurrent tasks: a manual data entry task using experimental keypads and a visual detection task requiring them to acknowledge obscured roadside signs. The study utilized a within-subject design comparing six interface conditions: a physical keypad, a small-key touchscreen with visual-only feedback, and small-key touchscreens with added auditory, vibrotactile, or combined auditory-vibrotactile feedback, as well as a large-key touchscreen with multisensory feedback. Performance metrics included input accuracy and efficiency for the data entry task, and detection rate and response promptness for the visual detection task. Perceived workload was also measured using the NASA-Task Load Index. Results indicated that the addition of synthetic nonvisual feedback significantly improved drivers’ visual detection performance. Participants using touchscreens with only visual feedback exhibited significantly lower detection rates and slower response promptness compared to those using interfaces with auditory or vibrotactile feedback. Notably, when multisensory feedback was provided, touchscreen performance did not differ significantly from the physical keypad, suggesting that synthetic feedback can effectively compensate for the loss of naturalistic cues. While interface characteristics affected input accuracy and efficiency, key size did not significantly impact performance when synthetic feedback was available. Contrary to some prior simulator-based studies, no significant differences in perceived workload were found across interface conditions. The findings demonstrate that synthetic nonvisual feedback is a critical design factor for in-vehicle touchscreens, as it supports visual attention and enhances multitasking performance without requiring proprietary haptic hardware. This suggests that simple auditory or vibrotactile cues can mitigate the distraction potential associated with touchscreen interfaces, bringing their safety profile closer to that of physical controls. These results provide evidence-based guidance for interface designers and policymakers, highlighting the importance of multimodal feedback in reducing visual demands and improving driver safety in vehicles equipped with touchscreen controls.
Key finding
The addition of synthetic nonvisual feedback to touchscreen interaction significantly improved accuracy and promptness of visual detection, eliminating performance differences between touchscreens and physical keypads.
Methodology
on_road
Sample size: 29
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Applied Guidance: design guidelines
- Empirical Findings: behavioral performance data
- Methodological Resource: measurement protocol