自由流速度变化下不同路网形态性能变化分析

Different Forms of Road Network Performance Analysis with Free-flow Speed Increases

在经典元胞传输模型的基础上,采用全局无控制策略构建城市道路元胞传输模型,对方格网式路网和环形放射式路网进行仿真。定量分析在自由流速度增大情况下2种路网网络性能变化迥异。仿真结果表明:方格网式路网和环形放射式路网走走停停的次数都随着自由流速度逐渐增大而增多;但随着自由流速度增大,方格网式路网总行车里程先增大后减小;而环形放射式路网总行车里程只呈现增大趋势。

Based on the classical cell transmission model （CTM） ,this paper adopted a uncontrolledglobal strategy to build urban roads, and then went on the simulation of square net-grid road network and ringradial road network on the basis of the built model algorithm and analyzed the differences of performance changes of the two types of road networks when the free-flow speed increased. The simulation results show that：the number of stopping and going of square net-grid road network and ring-radial road network both increase as the free-flow speed increases. The total traffic mileage of square net-grid road network firstincreases and then decreases as the free-flow speed increases, but the total traffic mileage of ring-radial road network increases as the free-flow speed increases.