Guidelines for Cost-Effective Safety Treatments of Roadside Ditches (2021) / Chapter Skim
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Pages 246-259
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A-2 INTRODUCTION As indicated in the main sections, the tentatively developed benefit-cost analysis (BCA) method is a workable method intended to strike a balance between three key goals given the available resources, data, and modeling capability in hand.
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A-3 Preferred Design Envelopes for Baseline Design Condition. Preferred Design Envelopes for Non-Baseline Conditions.
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A-4 Table A.1. Key variables, abbreviated names, and values.
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A-5 Table A.1. Key variables, abbreviated names, and values (continued)
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A-6 when the effects of foreslope width and backslope width (two of the baseline design variables) on the crash cost are discussed.
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A-7 miles traveled (enc/MVMT) or per mile per year (enc/mi/yr)
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A-8 ∑vt ∑es ∑ea ∑dci ECP(ht,psl,vt,es,ea,dci)
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A-9 severity probability (ISP) for the encroached vehicle to result in each police-reported injury severity level, i.e., pis, where pis=1,2, …, 6.
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A-10 Now, assuming that the effects are relatively smooth beyond the simulated data points, a general model can be formulated as follows: ECCA(ht,psl, FW,BW)
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A-11 ECC(ht,psl,aadt,hc*
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A-12 Compute ECCA(ht,psl, hc)
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A-13 ECCA for Ditch Bottom Width (btw) The baseline ditch bottom width is 0 ft (btw = 1)
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A-14 ECCA for Surface Treatment (surf) The baseline condition assumes no surface treatment (surf = 1)
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