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Are SUVs Supremely Unsafe Vehicles

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... of vehicle platforms, given single-vehicle crashes and 2) the severity of the ... Given a crash, the net SUV effect on injury is beneficial compared to car. ... – PowerPoint PPT presentation

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Title: Are SUVs Supremely Unsafe Vehicles


1
Are SUVs Supremely Unsafe Vehicles? Analysis of
Rollovers and Injuries Asad J. Khattak Marta S.
Rocha Carolina Transportation Program University
of North Carolina at Chapel Hill
Carolina Transportation Program
Abstract With increasing speed limits and more
light trucks penetrating the market, concern over
rollovers is growing. This paper presents a study
of how vehicle platforms influence rollovers and
injuries. Specifically, we explore 1) the
rollover intensity of vehicle platforms, given
single-vehicle crashes and 2) the severity of the
resulting driver injury. A federally maintained
NASS-CDS (National Automotive Sampling
System-Crashworthiness Data System) database was
used for crash analysis. This is a detailed and
relatively clean stratified sample of
police-reported tow-away crashes nationwide.
Rollover intensity, captured by the number of
quarter-turns, was investigated using weighted
negative binomial models injury severity,
measured on the abbreviated injury scale
maximum, critical, severe, serious, moderate,
minor and none, was examined using weighted
ordered logit models. As expected, SUVs were more
likely to roll over and therefore injure drivers
more severely. However, SUVs also protected their
occupant drivers during collisions due to their
greater crashworthiness.
  • Introduction
  • 10,000 deaths and 27,000 serious injuries per
    year in rollovers
  • Press versus Auto-Industry
  • SUV Supremely Unsafe Vehicles?
  • SUV Safe Utility Vehicles?

Rollover by Platform
Car (N 2,868)
SUV(N 728)
Van (N 182)
Pickup (N 774)
2
  • Key Results
  • SUVs 29 more likely to rollover compared with
    passenger cars
  • Rollover increase injury severity by 13.8
  • But SUVs reduce injury by 24
  • Given a crash, the net SUV effect on injury is
    beneficial compared to car.
  • NASS-CDS Dataset 1997 to 1999
  • General vehicle file vehicles, roadway and
    environmental conditions and rollover crashes
  • Occupant assessment file data related to
    drivers and driver behavior such as seat belt
    use
  • Single vehicle crashes in diagram below selected.

direct effect -23.9
04
05
Injury
29.0
13.8
Single Driver
Rollover
SUV
09
10
indirect effect 4
16
15
  • The crashworthiness effect of SUVs is much
    greater than the indirect rollover effect on
    injury severity.

Conceptually
  • Other Results
  • Driving-off-road and control/traction loss
    increase rollover intensity
  • Posted speeds greater than 80 km/h increase both
    rollover propensity and intensity
  • Tire blowout is associated with greater rollover
    propensity.
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