城市多模式道路网设计方法——模型、算法和应用

An Approach of Multimodal Network Design——Models,Algorithms and Application

为实现城市多模式道路优化,通过分析我国城市混行交通的特性,建立双层模型,对城市机动车道、自行车道、人行道进行整体设计。上层模型以各类车道数为设计变量,定义城市道路交通效率的3个指标,作为优化目标。下层模型将同时决策组合模型推广到混行交通,进行需求预测,并根据预测流量返算设计变量。设计3种启发式算法和对角化算法分别求解上下层模型,将该方法应用于淮北市的路网规划。对3个目标值各进行10次试算来检验算法,粒子群算法计算花费和解值最小;下层模型的拟合度达0.659,优于假设独立交通的拟合度0.375;优化后的路网可以合理解释不同优化目标,说明了文中方法的实用性。

In order to optimize the operation of the urban multimodal road network ,a bi‐level model is proposed in the study based on analyzing the interaction of the mixed traffic flow .A practical approach was developed to overall design the motor vehicle lanes ,bicycle lanes and pedestrian sidewalks as a whole .The upper model defined road traffic efficiency as an optimization objective .The lower model was an integrated model to forecast travel choices .Three heuristic algo‐rithms with the diagonalization algorithm were used to solve the bi‐level model .The proposed method was applied to the urban road network planning in the City of Huaibei .The proposed algorithms were evaluated on three target values by 30 trial runs each .The results indicate the PSO algorithm was the most efficient .The goodness‐of‐fit of lower model was 0 . 659 ,which was better than the independent traffic network 0 .375 .The network can be optimized to achieve different ob‐jectives .The results also conclude that the proposed approach is practical and feasible to be used in design and planning of multi‐modal road network .