Developing a Guide for Quantitative Approaches to Systemic Safety Analysis (2020)

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iv Contents Summary ..................................................................................................................................... vi  Introduction ....................................................................................................................1  1.1  Background ...........................................................................................................1  1.2  Summary of Primary Safety Management Approaches ........................................3  1.3  Research Objective and Scope ..............................................................................9  1.4  Overview of Research Methodology ...................................................................11  Summary of Literature Review ....................................................................................13  2.1  Domestic Applications of Systemic Safety Analyses .........................................13  2.2  International Applications of Systemic Safety Analyses ....................................26  Agency Survey of Practice...........................................................................................31  Summary of Agency Site Visits ...................................................................................45  4.1  Washington State Department of Transportation ................................................47  4.2  Thurston County Public Works (Washington State) ...........................................50  4.3  Oregon Department of Transportation ................................................................53  4.4  Texas Department of Transportation ...................................................................55  4.5  Kentucky Transportation Cabinet .......................................................................57  4.6  Rhode Island Department of Transportation .......................................................59  4.7  Maine Department of Transportation ..................................................................62  4.8  Minnesota Department of Transportation ...........................................................64  4.9  Utah Department of Transportation ....................................................................66  4.10  Summary of Systemic Safety Programs Reviewed .............................................68  Conclusions and Future Research ................................................................................74  5.1  Summary of Findings ..........................................................................................74  5.2  Lessons Learned ..................................................................................................76  5.3  Gaps in Knowledge and Future Research Needs ................................................77  References ...................................................................................................................78  Appendix A.  Implementation of the Research Findings ........................................................ A-1  This document is the Contractor’s Final Report for NCHRP Project 17-77 and supplements NCHRP Research Report 955: Guide for Quantitative Approaches to Systemic Safety Analysis. Readers can read or purchase NCHRP Research Report 955 at www.TRB.org.

v Figures Figure 1.  Sample Safety Priority Evaluation Matrix for an Intersection ....................................23  Figure 2.  Function to Determine Level of Funding for Proactive Projects ................................29  Tables Table 1.  Systemic Segment Scoring Worksheet for Pedestrian Crash Contributing Factors ....19  Table 2.  Systemic Segment Scoring Worksheet for BIcycle Crash Contributing Factors ........20  Table 3.  CMFs of Systemic Safety Improvements at Intersections in South Carolina ..............21  Table 4.  Safety Questions Considered During Site Visits .........................................................22  Table 5.  Safety Items for Quantifying the RRSI ........................................................................24  Table 6.  Evaluation of Probability Component of Road Safety Risk ........................................28  Table 7.  Spatial Database for Road Safety Diagnosis ...............................................................30  Table 8.  Summary of Systemic Safety Programs by Highway Agency ....................................69