Relationship of Traffic Fatality Rates to Maximum State Speed Limits

By the end of 2015, the maximum speed limit in 17 States was 75 mph or higher. This study looks at the impact of speed limit increases on fatalities in States from 1993 to 2013. Poisson regression was used to examine accident factors including unemployment rate, driver age, alcohol consumption, and maximum speed level. The number of fatalities expected each year if there had been no change in the maximum speed limit was modeled and compared to actual fatality rates. It is determined that an estimated 33,000 traffic fatalities during the years 1995-2013 is attributable to speed limit increases. A 5 mph increase in a State's maximum speed limit was associated with an 8% increase in fatality rates on interstates and freeways and a 4% increase on other roads.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 15p

Subject/Index Terms

Filing Info

  • Accession Number: 01619065
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 25 2016 1:53PM