Abstract

Crash modification factors (CMFs) are important tools for understanding the safety benefits of treatment options. However, CMFs typically lack variability as they apply a single factor to all the sites that are treated by these road safety measures. Crash modification functions (CMFunctions) are one way to capture the variability of CMFs as a function of independent variables. This research conducted a case study on the application of edgeline, centreline and dual rumble strip treatments on Ontario provincial highways and investigated CMF variability by developing CMFunctions as well as separate CMFs for tangent and curved sections. Curved sections experienced greater benefits from the application of the rumble strips. In conducting the study, the Highway Safety Manual’s application of rumble strip CMFs to Ontario roadways was also explored.

Highlights

  • The reasoning for studies on the effects of road safety treatments is to provide tools for organizations as they aim to reduce crashes and increase safety for all road users

  • Unlike the centreline rumble strips (CLRS), the edgeline rumble strips (ELRS) does not target this type of crash and the treatment may not have been applied to roads with higher counts for this crash type

  • All the Crash Modification Factors (CMFs) indicate a reduction in crashes, but only the CMFs for total and property-damage only (PDO) crashes are significant at the 95% confidence level

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Summary

Introduction

The reasoning for studies on the effects of road safety treatments is to provide tools for organizations as they aim to reduce crashes and increase safety for all road users Researching these treatments provides insight to their effects and justification for their implementation. Without the real-world data to provide an accurate EB study, the CMFs for the dual rumble strips could only be estimated through the combination of the CMFs for both the CLRS and ELRS treatments (Eskandar, 2018).

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