Roadside Hardware Replacement Analysis: User Guide (2021) / Chapter Skim
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From page 23... ...
17 4.1.1 Steps 1-8: Risk Assessment of Existing Guardrails First, the performance of the existing 27-inch w-beam guardrails must be established by examining crash records or an in-service evaluation. Based on 2010 through 2015 Pennsylvania Department of Transportation (PennDOT)
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18 4.1.3 Steps 12-17: Project Details for Guardrails Now that the relative risks of the existing and potential replacement guardrails are known or estimated, the specific details of a project can be examined. As discussed earlier there are 1,775 ft of w-beam guardrail in the 6.2-mile long project.
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From page 25... ...
19 4.2.2 Steps 9–11: Relative Risk Assessment of Replacement Terminals Quantifying the improved performance in the field of MASH 2016 guardrail terminals is challenging. The changes to the test matrix of MASH from those in Report 350 with respect to terminals were relatively minor.
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From page 26... ...
20 4.4 DISCUSSION The results of the analysis of the example problem discussed in the previous sections is sensitive to the assumptions that form the basis of estimating the replacement hardware performance. By definition, the new hardware likely has no field observed performance so estimating the performance will often be based on a combination of engineering judgement and intuition based on crash test results.
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From page 27... ...
21 Figure 2. Worksheet for Considering the Replacement of 27-inch W-Beam Guardrail with 31-inch W-Beam Guardrail and Associated Terminals.
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