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原文传递 Safety Comparison of Roadway Design Elements on Urban Collectors with Access. Final rept.

题名：	Safety Comparison of Roadway Design Elements on Urban Collectors with Access. Final rept.
作者：	Ozbay-K.; Yanmaz-Tuzel-O.; Ukkusuri-S.; Bartin-B.
关键词：	Roadway-safety; Roadway-operations.;New-Jersey; Design-elements; Countermeasures-; Data-sources; Comparisons-; Motor-vehicle-crashes.
摘要：	The main goal of this study identified by NJDOT can be defined as the quantification of the effects of management treatments on roadway operations and safety on urban collectors with access. Since, urban collector road runs through highly diversified areas, various factors have to be considered when before-and-after comparisons of improvements in terms of safety are conducted in this study. For 25-40 mph urban collectors with access, these are: (1) Increase in lane widths (10' or 11' to 12'); (2) Construction of 4,6,8, or 10 foot shoulders; (3) Removal of trees in median and border areas; and (4) Installation of guide rails, and vertical & horizontal geometry changes to improve sight distances. Before and after analysis for these countermeasures was conducted via several approaches, including naive approach, analysis via control groups, analysis via Empirical Bayes approach, and analysis via Full Bayes approach. After conducting before-and-after analysis, Crash Reduction Factors (CRF) were estimated for each countermeasure.
报告类型：	科技报告