快速路出口衔接过饱和交叉口信号优化方法  

Optimize Signal Timings for Oversaturated Intersections Connected with Urban Freeway Off-ramp

作　　者：张楠 杨晓光[1] ZHANG Nan;YANG Xiao-guang(The Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University,Shanghai 201804, China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《交通运输系统工程与信息》2018年第6期164-171,共8页Journal of Transportation Systems Engineering and Information Technology

基　　金：国家自然科学基金(重点)(51238008)~~

摘　　要：高峰时段内,由于地面道路通行能力有限,城市快速路出口匝道方向的地面交通流处于过饱和状态,甚至造成出口匝道排队溢出,引起更严重的交通拥堵.针对该问题,本研究在出口匝道和地面交叉口设置控制信号,考虑地面道路的通行能力约束,建立双层规划模型优化该区域交叉口的控制信号方案.该模型的下层规划,优化每个独立交叉口的控制信号方案;模型上层规划,优化区域交叉口的控制策略.利用乌鲁木齐外环快速路出口匝道区域作为实例,结合Vissim仿真对该模型进行验证与分析.结果表明,双层规划模型的优化方案可以有效地防止快速路出口排队溢出及主线拥堵,在提升该区域的整体系统性能上比运用常规非线性规划模型的效果更好.During the rush hours,due to the limited traffic capacity,the oversaturated traffic flow at the downstream of off-ramp often propagates traffic queue to spillover back to the mainline of freeway leading to more serious congestion.To prevent this problem in this paper,setting the control signals at the off-ramp and the connected surface intersections,a bi-level programming(BLP)model is proposed to optimize the control signal timings in this area.The lower level of BLP optimizes the signal times of each independent intersections as the basic control plan.The upper level of BLP is aimed at optimal control strategy for all intersections of the area with considering the capacity constraint of the surface roads.Finally,choosing the Urumqi East Race freeway off-ramp as an example,the optimized results of the BLP model are verified and analyzed combined with Vissim simulation.The results indicate that,for the problems raised in this paper,the signal plan optimized by the proposed BLP model can effectively prevent the off-ramp queuing spill over which is leading mainline congestion.It can be more significant improving the system performance than the conventional nonlinear model,which is an improvement to the conventional optimization method.

关 键 词：交通工程 最优控制信号 双层规划 过饱和交通流控制 通行能力限制 出口匝道控制 

分 类 号：U491.4[交通运输工程—交通运输规划与管理]