Development of Roundabout Crash Prediction Models and Methods (2019) / Chapter Skim
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Pages 35-41
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35 Framework for Safety Prediction and Data Needs This chapter presents the framework for roundabout safety prediction within this project. This framework defines candidate safety performance functions (SPFs)
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36 trends in a multijurisdiction database are due to differences in driver behavior or design practices (as may vary among jurisdictions) or due to differences in crash reporting thresholds and/or practices.
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37 Candidate SPFs would be attempted for various feasible combinations of numbers of entering, circulating, and exiting lanes. The latter are the exit lanes adjacent to the entry lanes (i.e., separated by the splitter island)
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38 objective in site selection will measurably increase the time needed for data collection because of the limited number of roundabouts in the United States. For example, speed will be correlated with most geometric variables.
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39 speed through a roundabout. One is presented in NCHRP Report 672 (Rodegerdts et al., 2010)
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40 the need for an alternative to predicting pedestrian and bicycle crashes at roundabouts. The findings from reviewing the pedestrian and bicycle crashes in the database are discussed in Chapter 6, Section 6.4.
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41 This requirement is twofold. First, the crash types discussed in Section 2.2.1 (e.g., entering-circulating)
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