Speed Limit Increases Are Tied To 37,000 Lives Over 25 Years

This brief article reports the findings of a recent Insurance Institute for Highway Safety (IIHS) study that evaluated the impact of speed limit increases in the United States on crash fatalities. The research was conducted to update a 2016 study. IIHS researchers analyzed the effect of changes in the maximum posted speed limit in every state from 1993 to 2017. In addition, the study analyzed other factors that affect fatality rates, from changes in unemployment, younger drivers, and seat belt usage to better calculate the effect of increases in speed limit. The study found that a 5 mph increase in the maximum speed limit was associated with an 8% increase in the fatality rate on interstates and freeways and a 3% increase on other roads. Readers are referred to the full report, available through IIHS.


  • English

Media Info

  • Media Type: Web
  • Features: Figures; Maps; Photos;
  • Pagination: pp 6-7
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01706022
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 21 2019 12:41PM