Modeling the Relationship Between IRI and Road Safety - Towards and Integrated Road Safety and Road Roughness Model

The mission of every highway agency in Canada and many parts of the world is to provide safe, reliable and economic road network. Safe roads are simply defined as roads with few collisions and reliable roads are commonly roads which are mostly passable and available to road users' year round. Many highway agencies such as Alberta Ministry of Transportation usually evaluate road safety by the number of collisions and assess the reliability of roads using a performance index called International Roughness Index (IRI). This Research aimed at modeling the relationship between International Roughness Index (IRI) and number of collisions in the Province of Alberta. Selected highways in the Province including Trans-Canada highway 2, 2A, 9, 15 and 16 were considered in this study. Panel Poisson regression modeling was employed to find the relationship between number of collisions as the dependent variable and average and maximum IRI and rutting depth were considered as the independent variables. Furthermore, correlation analysis was performed to check this relationship as well. According to the results, IRI showed significant relationship with the number of collisions while rutting was insignificant in most of the models. Results showed that the number of collisions increases by the increase in the average or maximum IRI value. (A) For the covering abstract of this conference see ITRD record number 201309RT334E.

  • Corporate Authors:


  • Authors:
    • Cowe Falls, L
  • Conference:
  • Publication Date: 2013


  • English

Media Info

  • Pagination: 10 p.
  • Monograph Title: Calgary 2013 - The Many Faces of Transportation - Technical Compendium

Subject/Index Terms

Filing Info

  • Accession Number: 01494283
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Sep 24 2013 12:59PM