平面式快速路出入口最小间距研究

平面式快速路是快速路的一种重要形式,其出入口最小间距影响因素复杂,科学确定其值对提高快速路的安全和效率具有重要意义。在分析已有快速路出入口最小间距计算方法的基础上,结合平面式快速路出入口特征,对四类出入口组合的出入口间距组成要素进行了深入分析,得到了平面式快速路出入口最小间距的计算方法。该计算方法以快速路主线车道数、主线流量、出入口流量、辅道流量为输入条件,计算满足一定服务水平下的出入口最小间距值。结果表明,该方法能综合反映各类影响因素,可针对具体条件得到更为科学的平面式快速路出入口最小间距值。

Minimum Length between Enhance and Exit of Expressway

Planar entrance and exit design is an important part of urban expressway.The minimum separation distance between a pair of entrance and exit are influenced by many factors and has big impact on the safety and efficiency of an expressway.By reviewing the existing computational methods for the designing minimum separation distance,this study evaluated four different designs of entrance and exit and developed a new computational method for planar expressway＇s entrance and exit.Using expressway＇s number of lanes and traffic volume,and volumes on entrance,exit,and service road as input,the methods gives the minimum separation distance based on the given level of service.This method can provide the most scientific value for the minimum distance between a pair of entrance and exit of expressway by comprehensively considering several influential elements.