Rollover Risk in Side Impacts of SUVs

Rollovers are a relatively rare motor vehicle crashes, but pose a significant risk of serious injury when they occur.  Rollovers only account for 2% of all motor vehicle crashes. However, rollovers account for 32% of all fatalities. [1] [2] The current side impact crash test protocols for the IIHS side impact test, FMVSS 214, and the NHTSA side impact NCAP test do not consider the risk of rollover in their performance criteria.Given that electronic stability control [ESC] is dependent on the tire-to-road coefficient of friction, ESC will be overwhelmed by the side impact forces that are greater than approximately 80% of the target vehicle’s weigh [3,500-4,500 lb., depending on the vehicle].Moreover, the risk of occupant injury in rollovers may be enhanced when the rollover is preceded by a side impact.  If the bullet vehicle has struck a component of the target vehicle’s occupant protective structure, such as the B-pillar, the roof strength may be compromised, which corresponds to an increased likelihood of more severe roof crush and less occupant protection. A case study is presented in which the track width of an SUV was increased by five inches which corresponded with the SSF increasing from 1.15 to 1.25.  The modified SUV was crash tested under NHTSA NCAP test protocol for side impacts, which resulted in no 2-wheel lift.  Whereas, the OEM SUV rolled onto its passenger’s side when it was tested under the same conditions with its tires inflated to 30 psi.


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Media Info

  • Media Type: Web
  • Features: Figures; References; Tables;
  • Pagination: 23p

Subject/Index Terms

Filing Info

  • Accession Number: 01764236
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00067
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:23AM