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Pages 107-133

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From page 107...
... 107   As stated earlier in this report, each study was developed with detailed steps to help agencies follow the protocol. Five studies were not piloted.
From page 108...
... 108 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research be combined with identified threat probabilities and consequences to create a risk index for each structure. As with the pavement section risk study, the implementation of the process outlined in this study takes advantage of any existing vulnerability assessments that the agency has already conducted or is conducting.
From page 109...
... Protocols Developed for Studies That Were Not Piloted 109   In this case, a large-scale vulnerability assessment that included culvert locations had been conducted and the data were provided for this study. A small subset of culvert locations was used to explain the proposed technique to develop an asset-level risk index.
From page 110...
... 110 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research work plan for the risk mitigation scenario could be used to select and plan risk-mitigating projects. The detailed process for producing Figure 10-1 is outlined in Appendix H
From page 111...
... Protocols Developed for Studies That Were Not Piloted 111   studies, the agency would have to commit some resource hours from the personnel who run the asset management system. Those personnel would need to have access to their management system as well as be able to perform the necessary additional configuration, run analyses, and generate reports of the results.
From page 112...
... 112 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research interruption to highway and road systems, it is beneficial to quantify that risk and determine where mitigation is necessary. 10.2.2 Description of the Technique or Tool This study developed a risk index based on a vulnerability study project performed for WVDOH on landslide hazard management.
From page 113...
... Protocols Developed for Studies That Were Not Piloted 113   10.2.4 Outputs from the Study The output from this proof of concept is an example landslide hazard risk index that would be stored for each pavement management section. This risk index could be forecasted along with the other pavement indices.
From page 114...
... 114 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research scenario for which no funding was dedicated to mitigate risks. The second scenario (dotted line)
From page 115...
... Protocols Developed for Studies That Were Not Piloted 115   10.2.7 Challenges to Expect and Suggestions on How to Plan for Them The difficulty in setting up and using this study methodology would depend somewhat on the available data and the management system used. For agencies that have a PMS in place, the additional setup and configuration to include landslide hazard risk should be relatively easy.
From page 116...
... 116 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research • Implementation Effort: Define normal asset management system modeling inputs, including asset inventory, starting condition indexes, deterioration models, and action improvement models. Then analyze and summarize resulting metric projections.
From page 117...
... Protocols Developed for Studies That Were Not Piloted 117   Actions Taken in the BMS For the proof-of-concept study, the existing BMS was already configured to produce a Paretoefficient frontier (explained in the following subsection)
From page 118...
... 118 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research downward. If these were actual funding values used by the agency, they would show that the funding allocated may not be sufficient to maintain condition over time.
From page 119...
... Protocols Developed for Studies That Were Not Piloted 119   10.4 Study 10: Decision Tree for Selecting Climate Risk Management Strategies Study 10 provides a decision tree for pavements impacted by higher temperatures to provide guidance on how to ultimately move from risk assessment to risk management of such pavements. Users could also apply similar decision trees to other asset and hazard combinations.
From page 120...
... Is the asset expected to perform after mid-century? No action needed How critical is the road segment?
From page 121...
... Protocols Developed for Studies That Were Not Piloted 121   Step 2: Consider Asset Criticality (How critical is the road segment?
From page 122...
... 122 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research 3. Retrofit – Description: Retrofitting involves making a physical adjustment to an existing design to accommodate projected changes in the design parameters.
From page 123...
... Protocols Developed for Studies That Were Not Piloted 123   4. Redesign.
From page 124...
... 124 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research • FHWA Vulnerability Assessment Scoring Tool (VAST)
From page 125...
... Protocols Developed for Studies That Were Not Piloted 125   treatment option to be selected from multiple options, each with different costs and uncertainty in results, DOTs may find it helpful to have an easy-to-use analytical tool to evaluate the options, expected costs and benefits, and probabilities of success in order to arrive at the most costeffective option. The tool used for this study was the decision tree.
From page 126...
... 126 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research A decision tree consists of three types of nodes: • Decision nodes, typically represented by squares • Chance nodes, typically represented by circles • Terminal or end nodes, typically represented by triangles In the example tested, treatment-related information (e.g., cost, life, prerequisites, possible outcomes of potential decisions, and related probabilities) was used as inputs.
From page 127...
... Protocols Developed for Studies That Were Not Piloted 127   If the retraining is successful, the logic used is retained for subsequent events. If the retraining fails, it is assumed that resurfacing is implemented.
From page 128...
... 128 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research cost based on the data from five state DOTs was computed. It was assumed that this ratio would be reasonably representative for PRHTA.
From page 129...
... Figure 10-5. Overall logic of the decision tree.
From page 130...
... 130 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research Step 3: Finalize Logic for the Decision Tree The overall logic summarized in the introductory paragraphs of the methodology is depicted in Figure 10-5. Note that cost data for the different decisions and alternatives are not yet entered into the tree.
From page 131...
... Figure 10-6. Completed decision tree relating to the chip seal versus resurfacing decision making for PRHTA.
From page 132...
... 132 Risk Assessment Techniques for Transportation Asset Management: Conduct of Research The numbers within the yellow decision node boxes identify the branch with the lowest cost that follows the decision node until the next decision node. The number 1 within the decision node references the uppermost of the alternatives.
From page 133...
... Protocols Developed for Studies That Were Not Piloted 133   10.5.6 Who in a DOT Could Use the Study Results and How The study results will be considered by the PRHTA pavement staff and the pavement management consultants as they consider options to present to the agency's executive leadership. At the time of this study, PRHTA's finances were severely constrained, and PRHTA Interstate and non-Interstate NHS pavements were well below national averages.

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