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Evaluation of Alternative Geometric Designs on Highway Corridors - Case Study of J Turns

项目名称：	Evaluation of Alternative Geometric Designs on Highway Corridors - Case Study of J Turns
摘要：	Alternative geometric designs such as J-turns, double crossover interchanges and continuous flow intersections have the potential to improve safety and traffic flow on freeways and arterials. The evaluation of such designs will provide information on their effectiveness and guidance for their proper deployment. J-turn intersection designs have been in operation in Maryland and North Carolina for years. They serve as an alternative to a two-way stop controlled intersection on high-speed roadways. By forcing the through and left turn movements from the minor street to turn right and make a U-turn at a downstream location, the J-turn design is safer due to fewer conflict points and less severe conflict types. Missouri Department of Transportation (DOT) has recently started using J-turn design as a corridor safety treatment on rural high-speed roads. As their first corridor deployment, MoDOT is constructing J-turns on an 8.5-mile stretch of U.S. 54 south of Jefferson City. This project will evaluate the safety and operational benefits of this J-turn deployment. The analysis will focus on several safety and operational performance measures, including conflicts, actual crash statistics, driver confusion measures, heavy vehicle maneuverability, gap acceptance, and travel time measures. The study findings assist Missouri and other Midwest states with new knowledge on the benefits of J-turn design and guidance on when to consider deploying J-turns as a corridor level safety treatment.
状态：	Completed
资金：	24229.00
资助组织：	Research and Innovative Technology Administration
执行机构：	University of Missouri, Columbia
开始时间：	20120601
实际结束时间：	20131231
主题领域：	Construction；Design；Geotechnology；Highways；Operations and Traffic Management