城市快速路设计重难点分析

Research on the Important and Difficult Points of Urban Expressway Design

为了更全面正确地了解快速路设计在不同间距出入口组合设置条件下,在不同的交通流量下对快速路通行能力的影响,文章通过对厦门市仙岳路的运行状况分析,总结主要影响因素及问题所在,对快速路设计中要重点做好的出入口位置、间距、组合形式及交通影响分析等进行研究探讨,并通过VISSIM仿真模拟不同间距出入口在不同交通流量下的运行速度。结果表明:交通流量的大小比出入口间距组合对快速路通行能力的影响更大;快速路出入口间距设置对主线通行能力的影响与相交道路交通服务水平及通行能力密切相关;出入口加减速车道及辅助车道的设置对通行能力的影响。

In order to understand the influence of the design of expressway on the capacity of expressway under different traffic flow and under the condition of combination setting of entrances and exits with different spacing. This paper summarizes the main influencing factors and problems by analyzing the running condition of Xianyue Road in Xiamen City. Secondly, the location, spacing, combination form and traffic impact analysis of the entrance and exit which should be done well in the design of expressway are studied. Meanwhile, the running speed of different distance entrances and exits under different traffic flow is simulated by VISSIM.The results show that the influence of traffic flow on the capacity of expressway is greater than the combination of the distance between the entrances and exits. Secondly, the impact of the setting of the gap between the entrances and exits of expressways on the capacity of the main line is closely related to the service level and capacity of the intersecting roads. Furthermore, the setting of acceleration and deceleration lanes and auxiliary lanes at entrances and exits affects the traffic capacity.