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Driving performance at lateral system limits during partially automated driving.

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Drivers safely managed transitions to manual driving when partially automated systems reached their limits, even with distractions. However, understanding the reasons for take-over requests remains a challenge for many drivers.

Keywords:
Automated drivingControllabilityLateral scenariosPartial automation

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Area of Science:

  • Human-computer interaction
  • Automotive engineering
  • Cognitive psychology

Background:

  • Partially automated driving systems (PADS) are increasingly common.
  • Understanding driver behavior at system limits is crucial for safety.
  • Driver distraction and handover strategies impact performance.

Purpose of the Study:

  • To investigate driver performance during system limits of PADS.
  • To evaluate the effect of hands-off intervals and secondary tasks on driver takeover.
  • To assess driver comprehension and perception of take-over requests.

Main Methods:

  • Utilized a motion-based driving simulator.
  • Simulated scenarios where PADS lost lateral guidance.
  • Varied hands-off intervals (10s vs. 120s) and secondary task presence (distraction vs. no distraction).
  • Issued take-over requests when system limits were reached.

Main Results:

  • All drivers safely transitioned to manual control, regardless of hands-off duration or distraction.
  • No lane exceedances occurred; situations were perceived as harmless.
  • Many drivers maintained steering wheel contact even in 'hands-off' conditions.
  • Most drivers could not explain the reason for the take-over request.
  • Take-over request helpfulness was rated as intermediate.

Conclusions:

  • Drivers can safely manage PADS system limits under tested conditions.
  • The effectiveness of 'hands-off' intervals may be limited by continued driver engagement.
  • Improving driver understanding of system limitations and take-over triggers is essential.
  • Providing explicit reasons for take-over requests can enhance their helpfulness and driver trust.