A Proactive Approach to Evaluating Intersection Safety Using Hard-braking Data

Typical safety improvements at signalized intersections are identified and prioritized using crash data over 3-5 years. Enhanced probe data that provides date, time, heading, and location of hard braking events has recently become available to agencies. In a typical month, over six million hard-braking events are logged in the state of Indiana. This study compared rear-end crash data over a period of 4.5 years at 8 signalized intersections with weekday hard-braking data from July 2019. Using Spearman’s rank-order correlation, results indicated a strong correlation between hard-braking events and rear-end crashes occurring more than 400 ft upstream of an intersection. The paper concludes that hard-braking events occurring at a far distance from the stop bar may be a useful tool to screen potential locations of rear-end crashes and follow up with mitigation measures quicker than the 3-5 year cycle used by agencies that rely on crash data. Now that hard braking data is commercially available in the United States, these techniques scale quite easily to state and national levels for near immediate implementation.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Maps; References; Tables;
  • Pagination: 19p

Subject/Index Terms

Filing Info

  • Accession Number: 01764266
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-01539
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:23AM