连续流交叉口左转非机动车交通组织创新设计

为解决连续流交叉口左转非机动车和直行机动车冲突问题，提出一种左转非机动车过街创新设计方案，对比常规设计和两步过街方案，将3种方案整合到一个统一的优化模型中。以交叉口机动车通过量最大为优化目标，建立混合整数非线性规划优化模型，将其转换为非线性模型以便于求解，并利用VISSIM仿真验证3种方案的运行效益。结果表明，两步过街和创新设计相对于常规设计能提升交叉口机动车通行能力，且在高流量场景下拥堵改善效果更佳，分别能降低55.58%、57.18%的机动车延误；常规设计不适用于直行机动车流量较大的场景，两步过街和创新设计不适用于左转机动车流量较大的场景；常规设计和两步过街左转非机动车流量增加，会导致机动车通行能力迅速下降，创新设计受左转非机动车流量的影响较小，在各种流量场景下适用性较好。

Innovative Design of Transportation Organization for Left-turn Non-motor Vehicles at Continuous Flow Intersection

In order to resolve the conflict between left-turn non-motor vehicles and straight- going motor vehicles atcontinuous flow intersections, an innovative design scheme is proposed for the left-turn non-motor vehicles crossingstreets. Considering the conventional design and the two- step street crossing scheme, the three schemes wereintegrated into a unified optimization model. Taking the maximum vehicle throughput at the intersection as theoptimization objective, a mixed-integer nonlinear programming optimization model was established, which wastransformed into a nonlinear model. And the operational benefits of the three schemes were verified through VISSIMsimulation. The result indicates the two-step street crossing scheme and the innovative design scheme can improve thetraffic capacity of vehicles at intersections. The improvement can be more significant in high- flow scenarios, whichreduce the vehicle delay by 55.58% and 57.18%, respectively. The conventional design is not suitable for the scenewith the large straight-going motor flow, while the two-step street crossing scheme and the innovative design are notsuitable for the scene with large left-turn motor vehicle flow. The increase of left-turn non-motor vehicle flow in thetwo- step street crossing scheme and the conventional design will lead to a rapid decline of the vehicle capacity. Theinnovative design is less affected by the left-turn non-motor vehicle flow and it has good applicability in various trafficscenarios.