The Effects of an Eco-Driving Interface on Driver Safety and Fuel Efficiency
DOI: 10.17077/drivingassessment.1603
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Summary
This study investigates the trade-offs between fuel efficiency and driver safety when using real-time in-vehicle eco-driving assistance systems. Motivated by the need to reduce greenhouse gas emissions from road transport, the research addresses the concern that visual feedback systems, while effective for fuel savings, may distract drivers and impair safety. The authors aimed to determine the most effective interface modality for delivering eco-driving advice and to assess potential negative side effects on driver safety and workload. The researchers conducted a driving simulator study with 22 participants using a within-subjects design. Participants drove through hill scenarios with variable traffic density (low and high) under four conditions: no system (baseline), a visual display, a haptic force feedback pedal, and a haptic stiffness feedback pedal. The visual system provided color-coded guidance on gas pedal position, while the haptic systems altered pedal resistance to indicate efficient usage. Performance was measured by root mean squared gas pedal error (fuel efficiency), Percent Road Centre (visual attention), minimum time headway (safety margin), and subjective workload and acceptability ratings. Results indicated that both the visual and haptic force systems significantly reduced gas pedal errors compared to the baseline and haptic stiffness systems, thereby maximizing fuel efficiency. However, the visual system caused drivers to spend significantly less time looking at the road center, indicating increased visual distraction. In high-density traffic, drivers produced larger pedal errors, suggesting they prioritized safety over eco-driving. Despite this prioritization, minimum time headways were shorter in high traffic, particularly with the visual interface, implying that compensatory strategies were insufficient to maintain safety margins. Subjectively, the haptic force system resulted in the lowest workload, whereas the visual system was rated as more useful and satisfying despite higher workload demands. The findings suggest that haptic interfaces, particularly force feedback, offer a safer alternative to visual displays by minimizing visual distraction and reducing driver workload, though they may be less acceptable to users. The study highlights that drivers struggle to balance eco-driving and safety in dense traffic, often failing to maintain adequate safety margins even when attempting to prioritize safety. Consequently, the authors conclude that future eco-driving systems should adapt their guidance based on prevailing traffic conditions to prevent unsafe driving behaviors. The results support the development of multimodal systems that combine the effectiveness of visual feedback with the safety benefits of haptic cues.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | Crossref | — | — | 1 | 2026-06-16 |
| archive | success | canonical_url | — | — | 1 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-25 |
| clean | success | clean | — | — | 1 | 2026-06-20 |
| chunk | success | chunk | — | — | 1 | 2026-06-20 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-20 |
| enrich | success | openalex | — | — | 1 | 2026-06-20 |
| promote | success | — | — | — | 1 | 2026-06-16 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-25 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-20 |
| verify | partial | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-25; verification: verified_with_issues.
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