Roundabouts in the United States (2007) / Chapter Skim
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Pages 102-108
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102 This chapter presents a series of interpretations, appraisals, and applications of the major findings of this study. This chapter is organized into the following sections: • Application of intersection-level safety performance models • Estimation of the safety benefit of a contemplated conversion of an existing intersection to a roundabout • Application of approach-level safety models • Incorporation of safety models into other documents • Application of operational models Application of Intersection-Level Safety Performance Models The safety models and results presented in Chapter 3 can be used in a number of ways (with appropriate cautions)
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jurisdiction. At a minimum, data for at least 10 roundabouts with at least 60 crashes are needed.
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detailed investigation of safety performance. An alternative method is to rank sites by the difference between the EB estimate and the prediction model estimate.
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disaggregate unit costs of crashes by severity level, by type of facility (e.g., intersection type) , by impact type, and by environment (urban versus rural)
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Step P3. The intersection-level model (see Example 1)
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Nb predicted number of total intersection-related crashes per year for base conditions CMF1 .
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Capacity Two capacity models are recommended: a model for estimating the capacity of a single-lane entry into a single-lane circulatory roadway and a model for estimating the capacity of the critical lane of a two-lane entry into a two-lane circulatory roadway. Simple, empirical models were chosen for both for two reasons.
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