Phase 2 Evaluation of The Safer Road Infrastructure Program Stage 3 (SRIP3)

Research output: Book/ReportCommissioned Report


This report presents the results of the Phase 2 evaluation of Stage 3 of the Safer Road Infrastructure Program (SRIP3)which aims to reduce casualty and serious casualty crashes via infrastructure improvements to intersections and lengthsof road including implementation of 40km/h speed limits in strip shopping centres. Greyspot treatments completed underSRIP3 were also evaluated.Of the 721 SRIP3 projects approved, 553 projects with sufficient before and after treatment crash history were used inthe Phase 2 evaluation. Eighty‐two additional projects were at Greyspots and were analysed separately from the wholeprogram. The six projects identified by VicRoads on the Princess Highway East were not able to be analysed due to threebeing incomplete and because one of the incomplete projects (AS311) completely confounded the after treatment periodof the completed projects.The evaluation measured the effectiveness of the program based on the extent to which treatment implementation wasassociated with reduced number of casualty and serious crashes and injuries. Poisson regression was used to comparethe difference in before treatment and after treatment crash and injured persons counts at treated sites with those atsuitably chosen control sites.The Phase 2 evaluation estimated that, overall, implementation of SRIP3 was associated with statistically significant(p<0.0001) 21% casualty and 26% serious casualty crash reductions and lifetime casualties and serious casualties savedof 10,819 and 4,133 respectively. It was estimated that a 21% reduction in casualty crashes at treated sites over the lifeof the program will deliver a benefit‐cost ratio of 3.6:1, thus indicating that the recurrent benefits that the programprovides through reduced costs of road trauma to the community exceeds the costs of completing and maintainingtreatments. Other economic measures of effectiveness, including net present worth, internal rate of return and costeffectivenesswere also estimated.Estimates of associated crash effects were also derived for different types of treatments and for treatments grouped bylocation, treatment types, project type and crash type. Injury analyses for specific road users were also attempted. Theestimated casualty crash reduction associated with the Phase 2 implementation of SRIP3 was 13% for road segmentprojects (95% CI: 6%, 20%) and 37% (95% CI: 32%, 42%) for intersection projects. Intersection treatments were associatedwith estimated lifetime savings of 7,218 casualties. Road segment treatments were associated with estimated lifetimesavings of 3,140 casualties. The implications of these results on planning for future road infrastructure improvementprograms are discussed.
Original languageEnglish
Place of PublicationMelbourne Vic Australia
PublisherMonash University
Commissioning bodyRoads Corporation (trading as VicRoads) (Victoria)
Number of pages201
Publication statusPublished - Mar 2016


  • Infrastructure improvement
  • evaluation
  • accident analysis
  • traffic engineering
  • statistical analysis
  • economic analysis
  • intersection
  • run‐off‐road
  • wire rope barrier
  • guard fence
  • shoulder sealing
  • delineation

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