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原文传递 Support for the Development and Implementation of an Access Management Program through Research and Analysis of Collision Data

题名：	Support for the Development and Implementation of an Access Management Program through Research and Analysis of Collision Data
作者：	Sarasua, W.; Davis, W.; Ogle, J.; Huynh, N.; Chowdhury, R.
关键词：	South Carolina (State)##Development##Access management programs##Access waivers##Driveway safety##Recommendation##Implementation##Driveway access##Driveway design##Traffic flow##South Carolina Department of Corrections (SCDC)##
摘要：	The South Carolina Access and Roadside Management Standards (ARMS) provides standards and guidelines for permitting access encroachments onto SCDOT right-of-way. In April, 2013, SCDOT initiated research that would be used to update this manual with the intent that recommended changes could result in a reduction in crashes, injuries, and fatalities on South Carolina roadways. The research examined current and historical practices used by other transportation agencies with regard to access management. Using empirical data collected along several corridors that ranked highest in driveway related crashes, the researchers statistically analyzed and identified the correlation of access issues with crash data. Crash data were associated with driveways using complex Geographic Information System (GIS) modeling tools. The statistical analysis identified several significant independent variables that influence crash rates either positively or negatively. The results indicate that increasing the distance between driveways, increasing the number of entry lanes, and having a raised median will decrease driveway related crashes. Conversely, increasing driveway width, corridor volume and corridor speed limit will increase crashes. Similarly, a driveway with high turnover land use, a driveway with full access (as opposed to right-in right-out), and the presence of nearby signalized intersections will increase crashes. A micro-simulation analysis was used to investigate the operational performance of different driveway spacing policies adopted by various DOTs in the US. Experimental results indicate that driveway spacing has direct influence on the average travel speed of a corridor. Since reduced driveway spacing negatively impacts corridor travel speed, selection of a minimum spacing should consider its effect on the operational performance of the corridor. Benefit-cost analyses of two different access modification strategies following the Highway Safety Manual (HSM) procedures suggest that it is beneficial to convert a TWLTL to a raised median. Similarly, it is beneficial to reduce the driveway density on a corridor. The research also reviewed SCDOT access waiver procedures. While the current process suffices based on our literature review it is evident that this process could be significantly streamlined and enhanced with a paperless system. Based on research findings, recommended changes to SCDOT Access and Roadside Management Standards (ARMS) are presented. It is anticipated that implementation of the findings of this research will result in long-term economic benefits, and improved traffic flow and safety.
总页数：	128
报告类型：	科技报告