Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers (2022) / Chapter Skim
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Pages 33-40
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From page 33... ...
33 C H A P T E R 4 The statement of work for this research called for using both a risk-based and benefit–costbased approach in the development of the guidelines. In the very short period since this work commenced, two separate but influential research efforts were completed that caused a shift in the approach to both geometric and roadside design.
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34 Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers EAFS = Highway and traffic characteristic encroachment adjustment factors for the highway segment of interest. LS = Segment length in miles.
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Methodology 35 downstream face of the last feature plus VW sin(θ85) as long as the spacing between features is less than WB/tan θ15.
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36 Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers heading represents a variable of the governing equation that will be used for MASH median and roadside barrier selection and placement guideline development. Detailed statistical modeling is provided, when necessary, in the appendices to support these variable summaries, as outlined below.
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Methodology 37 Yj (ft)
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38 Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers 4.3 Probability of Passing Through a Feature (THRj) THRj is "the conditional probability of passing through feature j given the vehicle interacts with feature j." (Ray, forthcoming)
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From page 39... ...
Methodology 39 analysis of the simulated data are documented in Appendix E Probability of Passing Across the Opposing Lanes (THREOL)
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40 Selection and Placement Guidelines for Test Level 2 Through Test Level 5 Median Barriers Lane Volume (veh/day) THREOL Rural THREOL Urban Lane Volume (veh/day)
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