Developing a Guide for Quantitative Approaches to Systemic Safety Analysis (2020) / Chapter Skim
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13 Summary of Literature Review A number of highway agencies, both in the United States and internationally, have been implementing systemic safety management approaches for several years. This section summarizes how agencies in the United States and abroad have implemented systemic safety management approaches within their agencies.
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14 crash characteristics overrepresented on different low-volume road categories. The comparison group was primary road crashes.
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15 9. Local road crashes occurred at a higher frequency in the summer and fall and were lower in winter months.
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16 The Minnesota County Road Safety Plan (CRSP) approach The FHWA Systemic Safety Project Selection Tool usRAP The New Jersey systemic road safety tool Safety Analyst software The five tools/methodologies were summarized and compared through the consideration of five attributes: (1)
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17 For the sensitivity analysis using usRAP, the type and number of countermeasures suggested by usRAP were compared for acceptable benefit-cost ratios of both one and two. Not surprisingly, the increase in acceptable benefit-cost ratio from one to two resulted in the suggestion of fewer countermeasures and produced a higher overall benefit-cost ratio for the group of countermeasures suggested.
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18 of fatal and serious-injury pedestrian and bicycle crashes. Results from both screening methods were combined to prioritize candidate project corridors.
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19 Table 1 and Table 2 illustrate the segment scoring system developed to rank the priority of sites based on the presence pedestrian and bicycle crash contributing factors. ODOT applied the scoring methodology to rank 9,490 segments (0.1 mi each)
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20 Table 2. Systemic Segment Scoring Worksheet for BIcycle Crash Contributing Factors (Bergh et al., 2015)
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21 yield better crash frequency models in terms of different crash types, it was established that multivariate correlations plays a stronger role than the spatial correlation. The results yielded the number of crashes, by crash type, for each rural, two-lane roadway segment.
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22 South Dakota Rural Road Safety Index Mahgoub et al.
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23 Figure 1. Sample Safety Priority Evaluation Matrix for an Intersection (Mahgoub et al., 2011)
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24 Table 5. Safety Items for Quantifying the RRSI (Mahgoub et al., 2011)
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25 Austin, Texas. Though the study proved ultimately to be inconclusive, several important insights were drawn from the research process.
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26 detailed, yet extensive assessment of the entire travel environment. The CSA method takes into account characteristics of the traveled way, the roadside environment, as well as all relevant traffic control features.
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27 countries, the respect citizens have for the law may not be as great as in developed nations. Another example is that car manufacturers do not include the same safety features in cars in different countries.
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28 Table 6. Evaluation of Probability Component of Road Safety Risk (de Leur and Hill, 2015)
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29 Figure 2. Function to Determine Level of Funding for Proactive Projects (de Leur and Hill, 2015)
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30 Table 7. Spatial Database for Road Safety Diagnosis (Rondier et al., 2014)
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