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首页> 外文会议>Transportation Research Board Annual meeting >Performance Evaluation of Roundabouts for Traffic Flow Improvements and Crash Reductions at a Highway Interchange in Oxford, MS
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Performance Evaluation of Roundabouts for Traffic Flow Improvements and Crash Reductions at a Highway Interchange in Oxford, MS

机译：密西根州牛津市高速公路立交处回旋处改善交通流量和减少碰撞的性能评估

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Due to increased traffic volume and congestion, conflicting movements, and capacity limitations,two roundabouts have been constructed by converting the existing signalized intersection in thenorth and stop controlled intersections in the south side on South Lamar Boulevard and MSHighway 6 Interchange in Oxford, MS. The overall objective of this study was to assess theperformance of the roundabouts in Oxford with respect to traffic flow, capacity, safetyimprovements, and a public opinion survey. Detailed post-roundabout traffic movement volumeand crash data were collected and compared with the pre-roundabout data to assess the in-serviceperformance of these roundabouts.The results of the Oxford roundabout study showed significant improvement in trafficflow, crash reduction, and reduction in vehicle emissions. It was found that the conversion of theintersections to roundabouts improved traffic flow by reducing average delay by 24%, idlingtime by 77%, and fuel wastage by 56%. Overall vehicle emissions from idling were reducedsignificantly. The roundabout conversion increased the mean speed on the South Lamarinterchange by 67% and improved level of service for both roundabouts. The roundaboutjunctions improved safety performance through: a 37.5% reduction in crashes and a 60%reduction in the number of crashes resulting in injury. The reduction in overall crashes in thestudy area reduced comprehensive cost by 54.4%. Additional user cost savings of $806,071were calculated annually from reductions in travel time and fuel wastage. These benefits paidoff the total construction cost of the roundabouts within two years. The anonymous publicopinion survey overwhelmingly shows favorable results and provides support to build moreroundabout junctions in place of stop-controlled intersections. The study results indicate thatroundabouts are performing well as intended. It is a preferable solution to improve capacity andsafety compared to signal control and stop controlled intersections.
机译：由于交通量和拥堵情况增加，行动冲突和容量限制， 通过转换道路中现有的信号交叉口，已经构建了两个回旋处 向北，在南拉马尔大道（South Lamar Boulevard）和MS的南侧停止受控制的十字路口 密西根州牛津市的6号公路交汇处。这项研究的总体目标是评估 牛津环形交叉路口在交通流量，通行能力，安全性方面的表现 改进和民意调查。详细的回旋处交通量 收集碰撞数据，并将其与回旋前数据进行比较，以评估运行中的情况 这些回旋处的性能。 牛津环形交叉路口研究的结果表明，交通流量有了显着改善 流量，减少碰撞和减少车辆排放。发现， 空转与交叉路口的交叉口可将平均延迟时间降低24％，从而改善了交通流量 时间减少了77％，燃油浪费减少了56％。减少了空转造成的总体车辆排放 显着地。回旋处的转换提高了南拉马尔的平均速度 交叉路口的换乘量提高了67％，服务水平得到了改善。回旋处 交叉路口通过以下方面改善了安全性能：减少了37.5％的撞车事故，减少了60％的撞车事故 减少导致受伤的撞车次数。减少总体崩溃 研究区域使综合成本降低了54.4％。用户节省的额外费用为$ 806,071 每年根据减少的旅行时间和燃油浪费进行计算。已付的这些福利 在两年内减少了回旋处的总建设成本。匿名公众 意见调查以压倒性多数显示出令人满意的结果，并为建立更多 环形交叉路口代替停靠点控制的交叉路口。研究结果表明 回旋处的运行情况达到了预期的效果。这是提高容量和效率的最佳解决方案。 与信号控制和停车控制交叉口相比，安全性更高。

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