Guidance for Evaluating the Safety Impacts of Intersection Sight Distance (2018) / Chapter Skim
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Pages 34-35
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From page 34... ...
34 Base Equations for Reference CMFunctions Charts A-1 to A-6 present CMFunctions based on the following equation for target crashes: = − × + × + − × + − × − × + × + − × + − × exp 0.021 7.194 243.009 177.826 exp 0.021 7.194 243.009 177.826 CMF PSL PSL ISD LowAADT ISD MidAADT ISD PSL PSL ISD LowAADT ISD MidAADT ISD T i maj i maj i base maj base maj base i where: CMFTi = target crash CMF for condition of interest i; PSL = posted speed (in mph) ; LowAADTmaj = 1 if major-road AADT ≤ 5,000; otherwise 0; MidAADTmaj = 1 if 5,000 < major-road AADT ≤ 15,000; otherwise 0; ISDi = proposed or existing available intersection sight distance for the condition of interest i (in feet)
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From page 35... ...
Base equations for reference 35 in the charts. The minimum ISD for each posted speed corresponds to the design ISD based on left turns for an equivalent design speed minus 250 ft.
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