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原文传递 Median Crossover Accident Analyses and the Effectiveness of Median Barriers. Final research rept.

题名：	Median Crossover Accident Analyses and the Effectiveness of Median Barriers. Final research rept.
作者：	Chayanan-S.; Sittkariya-S.; Shyu-M.B.; Shankar-V.; Ulfarsson-G.
关键词：	Median-crossovers; Median-barriers.;Accident-data; Effectiveness-; Traffic-operations; Washington-State; Highway-safety; Data-analysis.
摘要：	This research explored the use of count models to determine design and weather factors correlated with median crossover crashes on Washington State highways. The study (1) developed a roadside data system that can be consistently and systematically used in all six regions of Washington State; (2) developed a decision matrix comprising geometric, environmental, and traffic factors for estimating crossover probability ranges; and (3) examined the impacts of barriering. Longitudinal data for the period 1990 to 1994 containing crash information on vehicle crossovers on non-barriered medians on Washington State highways were used as the dataset for this study. Two types of statistical models were examined: (1) a model that forecasts the mean number of yearly median crossovers, and (2) a model that examines the contribution of roadway geometrics, median widths, weather, traffic volumes and roadside characteristics to the annual societal cost of median crossovers.
报告类型：	科技报告