入口匝道衔接区域交通流运行机理解析

Operation Mechanism of Traffic Flow in Join Area of Expressway and On-ramp

摘要:

由于对交通流运行和演变机理解析不足,从而导致入口匝道管理和控制策略缺乏针对性和实际可操作性,采用波动理论方法建立数学模型,分析不同匝道和主线上游流量条件下,合流区、匝道合流区上游、合流区下游及匝道等处的交通流运行状态和交通流的演变规律,解析入口匝道无控制时拥堵的形成和传播机理,从而为相关管理和控制策略的提出和优化提供理论支持.实例分析表明,衔接区域交通流运行规律与实际交通流运行符合较好.

Abstract:

Since operation mechanism of traffic flow has not been given enough emphasis to the management and control strategy of on ramp is short of pertinence and maneuverability.Models were built on the basis of the kinematic wave theory to study the operation station and evolvement rule of traffic flow in the join area of expressway and on ramp together with traffic flow of upstream,downstream and ramp under different flow rate.The formation and transmission rule of traffic jam in the join area without any control strategy are also studied.Analysis with actual traffic data shows that the operation mechanism proposed in this paper agrees well with the actual traffic operation in the join area.