Effect of Adaptive and Fixed Shared Steering Control on Distracted Driver Behavior

Wang, Zheng; Suga, Satoshi; Nacpil, Edric John Cruz; Yang, Bo; Nakano, Kimihiko · 2021 · arXiv

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Summary

This study investigates the impact of adaptive versus fixed shared steering control on the behavior of distracted drivers. Driver distraction is a major cause of traffic accidents, and while shared steering systems that provide haptic guidance torque have shown promise in improving performance, the specific effects of adaptive authority—where automation levels adjust based on the driver’s physiological state—on distracted drivers remain unclear. The researchers hypothesized that adaptive haptic guidance would offer greater safety and comfort for distracted drivers, whereas fixed authority guidance might more effectively reduce the duration of lane changes. To test these hypotheses, the authors conducted a high-fidelity driving simulator experiment with 18 participants. The study utilized a 6x6 Latin Square design to counterbalance conditions, involving two driver states (attentive and distracted) and three haptic guidance types: manual steering, fixed authority haptic guidance, and adaptive authority haptic guidance. Distraction was induced using a paced auditory serial addition task. The adaptive system adjusted its torque gain based on real-time forearm surface electromyography (sEMG) signals, which served as a proxy for driver grip strength and control authority. Participants performed double lane change tasks at a constant speed of 50 km/h. Performance was evaluated using objective metrics, including driver input torque, steering wheel angle, lane departure risk (lateral error), and task duration, as well as subjective workload assessments via the NASA-TLX questionnaire. The results demonstrated that adaptive haptic guidance yielded lower driver workload and reduced lane departure risk for both attentive and distracted drivers compared to manual driving and fixed authority guidance. Specifically, adaptive guidance significantly reduced lateral error during the first lane change stage. In contrast, fixed authority guidance resulted in shorter double lane change durations for distracted drivers. This reduction in duration was attributed to distracted drivers reducing their grip strength on the steering wheel, thereby increasing admittance to the fixed haptic guidance and allowing the system to execute maneuvers more quickly. Additionally, haptic guidance generally reduced the steering effort required by drivers, with adaptive guidance being the most effective in lowering input torque. Subjective evaluations confirmed that drivers preferred adaptive guidance over both fixed and manual conditions, particularly under distracted states. The findings suggest that adaptive shared steering control, driven by physiological feedback, is superior for enhancing safety and reducing workload for distracted drivers. However, fixed authority systems may facilitate faster maneuver completion by encouraging drivers to cede control. The study concludes that while adaptive systems improve overall performance metrics, future research should explore more demanding secondary tasks to assess system efficacy under higher levels of distraction and risk.

Key finding

Adaptive shared steering control modulated by sEMG-derived grip strength reduced workload and lane-departure risk for distracted drivers more effectively than fixed-authority haptic guidance or manual driving.

Methodology

simulator

Sample size: 18 (16 men, 2 women; mean age 23.5, SD 2.8; mean driving experience 2.7 years, SD 2.6)

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 discover_arxiv on 2026-05-04 (3 acquisition events logged).

Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• manual
• steering pattern
• visual manual
• haptic feedback
• temporal
• visual

Information type

What kind of knowledge this paper contributes, grouped by family — independent of topic (what it is about) and method (how it was studied).

• Empirical Findings: behavioral performance data
• Theoretical Contribution: conceptual framework, computational model