开放街区条件下的微循环道路网络设计

适当合理开放城市街区内部道路，利用街区内部高密度的支路网络充当主路分流的交通毛细血管，打开交通微循环，可以达到减少城市交通盲点，缓解局部交通拥堵的目的.以街区内部所有道路为可选道路集，路段饱和度超限量最小化和 OD车流绕行距离最小为优化目标，建立街区内部交通微循环网络优化双层规划模型.利用遗传算法求解得到最优的支路改造路段集合与区域内微循环路网的组织方式.通过算例对比分析，与封闭街区相比，开放街区部分支路组织微循环，可以实现最小化改造成本和最大化通行效率的目标，明显减小周边干道交通流饱和程度及车辆绕行距离.

Designing Microcirculatory Road Network for Open Block System

Opening and using the internal high- density roads of urban blocks to design the microcirculatory traffic network can divert the traffic flow on main roads, reduce the traffic blind spots and alleviate the local traffic congestion. Taking all roads in the block as an optional road set, the bi- level planning model of optimizing microcirculation organization is set up with the aim of minimizing the ultra- limited saturation and the bypass distance of trip origin- destination. The optimal branch road reconstruction segment and the organization of the microcirculatory network in the region can be figured out by genetic algorithm. An example is provided to show that the traffic microcirculation organization in the open block could achieve the goal of minimizing the transformation cost and maximizing the traffic efficiency, and significantly reduce the saturation of traffic flow and the vehicle bypass distance.