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原文传递 Investigation of Access Point Density and Raised Medians: Crash Analysis and Micro-Simulation.

题名：	Investigation of Access Point Density and Raised Medians: Crash Analysis and Micro-Simulation.
作者：	EISELE, W. L.; FRAWLEY, W. E.
关键词：	Accident-analysis; Medians-.;Accident-rates; Simulation-; Case-studies; Raised-road-islands; Driveways-; Intersections-; Data-collection; Data-analysis.
摘要：	This product provides usable information yielded from researching access management benefits. The product describes the findings of micro-simulation performed on real and theoretical corridors. The microsimulation resulted in impacts that can be anticipated if certain access management techniques are implemented on arterial streets, given certain conditions. In addition, the product provides findings from crash analyses performed on case study corridors in Texas and Oklahoma. The case studies include corridors with and without raised medians, before and after raised median presence, and varying access point densities. The research team studied 11 corridors to determine relationships between crash rates and access point (driveways and public street intersections) densities, as well as the presence of raised medians or two-way left-turn lanes (TWLTSs). Some corridors had two or more distinct segments, each with varying access point densities. Researchers obtained crash history and traffic volumes for each of the corridor segments. The Texas Department of Public Safety (DPS) provided crash reports for each of the corridors that are state-maintained roads. For the other corridors in Texas, city police departments provided crash information. The Oklahoma Department of Transportation (ODOT) provided crash information for the Tulsa corridor. Researchers calculated crash rates (crashes per million vehicle miles traveled (VMT)) for each of the corridor segments studied. Crash rates were determined using average daily traffic (ADT) volumes for each corridor segment provided by state, regional, and local agencies; the distances of each corridor segment; and the numbers of crashes reported. Annual traffic volumes were available for most of the corridor segments; however, in some cases missing years' data had to be interpolated.
报告类型：	科技报告