VISSIM仿真在单向交通组织方案比选与评价中的应用

单向交通组织具有缓解交通拥堵、便于实施的优势,但由此带来的绕行、末端压力等交通负担可能会降低更大范围内的交通效率.因此,有必要基于微观交通仿真软件VISSIM的功能及特点,开发出对道路单向交通系统进行方案比选与仿真评价的具体方法,并在西安市唐延路单向交通系统中进行实践.首先对比现状交通与实施单向交通组织仿真模型中的交通效率,证明实施单向交通组织可缓解交通拥堵.其次,针对仿真模型中存在的冲突点提出改善方案.最后,通过方案比选获得最优交通组织方式.实践证明,该方法可以直观、定量、准确地模拟并优化单向交通组织中的单行定向、系统末端交通设计、系统信号控制方案设计及交叉口渠化等设计环节,为单向交通组织方案设计、比选和优化提供科学依据.

Application of VISSIM Simulation on Evaluation of One-way Traffic Plans

The implementation of One-way traffic system is encouraged to some degree due to its function in relieving congestion and wide applicability, however, it may also result in a long-distance detour and in-creasing traffic pressures at end-point zones which would consequently harm traffic efficiency in other hand. Therefore, development of simulation-based methodology to evaluate one-way traffic plans turns to be a critical issue which is expected to avoid impolicy in decision making. This paper addressed a simula-tion tool based on VISSIM platform to assess the impacts of Tangyan Road one-way system in Xi' an. Firstly, the comparison of the simulation output with surveyed data reveals that one-way system is able to release traffic congestion to some degree, and then, several plans are further proposed for coping with con-flict points detected by simulation. The main findings suggest that the proposed methodology is able to sim-ulate and evaluate the one-way traffic plans as well as optimizing traffic organization plan, signal plan, and intersection channelization that are function in assisting decision making and proposal selection of one-way traffic plan.