基于动态交通分配的杭州湾跨海大桥紧急事件管理

A Simulationbased Dynamic Traffic Assignment Model for Incident Management on Hangzhou Bay Bridge

摘要:

以环杭州湾区域内高速公路和主要干道组成的路网为研究对象,建立VISSIM动态交通分配仿真模型,模拟杭州湾跨海大桥发生紧急事件的多种场景;从路网、路径和路段3个层面出发,评估不同严重程度事故对路网整体运行状况的影响;量化评估车载诱导系统的作用.结果表明,事件持续时间是影响路网运行最关键的因素,相关部门的应急救援能力急需提高;由于大桥现有交通需求远未达到饱和,封闭车道数造成的影响并不明显;事件发生地点对路网运行状况有所影响;使用车载诱导系统可以明显缩减出行整体行程时间,改善出行质量,但其效果与装载比例并非成线性关系.

Abstract:

The object is to develop a simulationbased dynamic traffic assignment model to analyze the impact of various emergency situations and response countermeasures.The analysis was conducted from three perspectives:network,route,and link levels.The effectiveness of route guidance system (RGS) was also assessed.Simulation results reveal that incident duration is the most significant factor for network performance.For traffic crashes,clearance time and quick response are highly recommended.Lane closure has a relatively slight impact due to the low demand.Incidents occurring in the middle of the bridge have more influence on the traffic condition than the upstream.RGS has great potential to alleviate the traffic congestion due to incidents.However,the effectiveness is not consistent with the market penetration of equipped vehicles.