出入口匝道对快速路安全性的影响分析

快速路系统中,出入口匝道作为不开分割的一部分,对快速路的运行效果具有很大影响,一旦出入口匝道产生拥堵,将直接影响快速路的安全性。因此本文主要首先分析出入口匝道的位置设计、长度和出口匝道下游的交通状态对快速路运行状态的影响,建立基于出入口匝道的快速路运行状态模型,并分析交通运行状态与交通安全之间的联系,建立基于拥堵程度的快速路安全性模型。基于以上两个模型,实现基于出入口匝道的快速路安全性模型,并通过模拟验证,分析出入口匝道对快速路安全性的影响程度,最终得出结论：受出入口匝道车流汇入汇出的产生延误将会大大降低快速路的安全性。

Analysis of the Effect on Expressway Safety of on and off Ramps

As the very important parts of the express system, on and off ramps have a great effect on operation effect of expressway. Once congestion occurs at on and off ramp, it will directly affect the safety of expressway. So this paper first analyzes the location design of on ramps, the length and the influences on the expressway running state of off ramp downstream traffic state, and establishes the expressway operation model based at on and off ramps. At the same time, the paper analyzes the connection between the traffic operation state and traffic safety, and established the expressway safety model based on congestion degree. Through simulation verification, the impact of on and off ramp on the security of the expressway is analyzed. Finally the paper concluded that delay caused by traffic on and off ramp can decrease the safety of expressway.