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Driver head locations: Considerations for head restraint design.

Jangwoon Park1, Monica L H Jones2, Sheila M Ebert2

  • 1a Department of Engineering , Texas A&M University-Corpus Christi , Corpus Christi , Texas.

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Summary
This summary is machine-generated.

Smaller head restraint backsets improve neck injury protection but can cause discomfort. This study analyzed driver head positions to guide safer, more comfortable head restraint design, supporting FMVSS 202a flexibility.

Keywords:
Backsetdisaccommodationdriverhead locationhead restraintseat back angle

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Area of Science:

  • Automotive safety engineering
  • Human factors research
  • Biomechanics of injury

Background:

  • Federal Motor Vehicle Safety Standard (FMVSS) 202a mandates head restraint proximity to the headform.
  • Reduced backset (distance) in head restraints is linked to better rear-impact protection.
  • However, small backsets can lead to driver complaints about head position interference.

Purpose of the Study:

  • To investigate head and head restraint distances using driving posture data.
  • To provide evidence-based recommendations for designing head restraints that are both safe and comfortable.
  • To analyze the trade-off between neck injury mitigation and driver comfort.

Main Methods:

  • Measured head positions of 88 U.S. drivers in a lab setting with a sedan seat.
  • Removed head restraints to record preferred driver head locations.
  • Analyzed 'disaccommodation' (interference) at various Head Restraint Measurement Device (HRMD)-referenced backsets (25-100 mm) and seat back angles (22°, 25°).

Main Results:

  • At 25° seat back angle, 17.9% and 5.2% of drivers experienced interference at 25 mm and 50 mm backsets, respectively.
  • More upright seat back angles (22°) resulted in higher accommodation rates (less interference) compared to 25°.
  • Data quantifies head position distributions and interference at different backsets and angles.

Conclusions:

  • Findings offer guidance for head restraint design, balancing FMVSS 202a compliance with occupant comfort.
  • Manufacturers can use this data to select head restraint positions minimizing both backset violations and disaccommodation.
  • The study supports the current FMVSS 202a allowance for testing at more upright seat back angles.